My rRelationship

All words in a title should be capitalized, with some exceptions such as conjunctions.

My relationship had in the ended, but I tookalked with my boyfriend about usour problems, because he just goes out with his friends, and me, than I'am all day in my house, he don't go, don'tI’m just at home all day. He doesn’t come back, he doesn’t have dinner, nothing.

I’m not entirely sure what you mean here but I tried to piece together what I could understand
1. “My relationship had in the end” is not grammatically correct and doesn’t make sense, I assumed that you meant “My relationship had ended”
2. You’d use “our” instead of “us” because our refers to something belonging to you and one or more people
Example: “Our family”
3. “I’am” looks like you tried to say “I’m”. When you add an apostrophe, you’re getting rid of a letter, think of it like this: In the word “don’t”, a combination of the words “do” and “not”, the apostrophe, serves at the n in “not”, leaving us with the word “don’t”.
4. Instead of saying “don’t dinner”, you would say “he doesn’t have dinner”. Dinner is a noun so you need to have a verb with it, in this case you’d use the verb “have”.

But I talked about this and he did promise that to change.

You do not need to include the word “that” in this sentence, unless you say “He did promise that he’d change.”

So, ion Friday, we gone in a coffewent to a cafe and driank a gin, and talked about us.ourselves and our relationship.

1. You wouldn’t say “in Friday” you’d say “on Friday”.
2. “Gone” is a past tense form of “go”, but that is for the past participle tense.
Ex: I have gone to the store.
You’d use “went” here instead.
Ex: I went to the store.
3. In Portuguese, “café” can translate to both “cafe” and “coffee” in English. “Cafe” refers to the place, while “coffee” refers to the drink.
4. “Us” technically works fine, but “ourselves” sounds more natural.

IOn Saturday, we eated a snack and gonewent to the " children's day" with usour godson.

1. While “eated” seems like the correct past tense of “eat”, we’d actually say “ate” since eat is an irregular verb.
2. I see that you’re saying “us” instead of “our” a lot. “Us” refers to you and one or more people, “our” is the possessive noun of something belonging to you and one or more people.
Examples:
“He walks with us”
“That is our dog”

I love so much this kid so much!

On Sunday, we gonewent to visit my grandmothers, and watcherd a film inmovie at my house.

1. Again, you’d use “went” instead of “gone” here.
2. “Film” works just fine, but “movie” sounds more natural
3. “In my house” is also technically correct, but “at my house” sounds more natural

My relationship had in thecame to an end, but I tospoke with my boyfriend about usour problems, because he just go. He goes out with his friends, and me, than I'am all day in my house, he don't go, don't dinner, nothing.I’m in my house all day.

But I talspoked about this and he did promise that to change.

So, in Friday, we gone in a coffee and drink a gin, and talked about us.

So, on Friday, we went to a coffee shop and drank again and spoke about us.

In Saturday we eated a snack and gone to the " children's day" with us godson.

On Saturday, we ate a snack and went to the “ Children’s Day” with our Godson.

I love so much this kid so much!

On Sunday, we gonewent to visit my grandmothers, and watcherd a film inat my house.

My rRelationship

Generally, all words in a title are capitalised (though exceptions exist). It might be good to follow title capitalisation rules.

My relationship hadworked out in the end, but I tookalked with my boyfriend about usour problems, because he just goes out with his friends, and me, thaen I'am all day in my house, all day; he doesn't go, don'come back, doesn't eat dinner, nothing.

I took my best guess at what you meant to say with this sentence, particular the first portion ("My relationship had in the end") and the final part ("he don't go, don't dinner, nothing"). Perhaps some native text can help clarify what you wanted to convey?

(1) work out: have a good result.
(2) "Us" is a pronoun. "Our" is the possessive, like "his", "her", "my", and "their".
(3) It should be "goes" and not "go", since "he" is singular.
(4) "I'm" is the contraction of "I am".
(5) "I'm all day in my house" is unnatural. Instead, we say "I'm in my house all day" or "all day I'm in my house".
(6) It should be "doesn't" and not "don't", since "he" is singular.
(7) "Dinner" is strictly a noun. You need verb in front of it, such as in "eat dinner" or "have dinner".

But I talked about this and he did promise that to change.

Alternatively, if you want to use "that": "But I talked about this and he did promise that he would change."

So, ion Friday, we gonewent in a coffee shop and driank a gin, and talked about uourselves.

(1) For days of the week, we use "on" instead of "in": "on Friday", "on Sunday", "on weekends", "on weekdays".
(2) It should be "went" and not "gone". Generally, the simple past tense is used when the past time period is specified. In this case, that time period is "Friday".
(3) It should be "drank" and not "drink", since you're writing in the past tense.
(4) "Ourselves" might be more appropriate than "us". "Us" might give the feeling that it's some third party that's talking about you, rather than yourselves.

IOn Saturday we eated a snack and gonewent to the " children's day" with usour godson.

"Eat" is an irregular verb. Its past tense is "ate".

I love so much this kid!

Alternatively: "I love this kid so much!" Some people might find this to be more natural, but both are okay.

On Sunday, we gonewent to visit my grandmothers, and watcherd a film in my house.

Do you have more than one grandmother? If so, your sentence is fine, but if you only have one, then you can write: "we went to visit my grandmother" or "we went to visit my grandmother's (place)".