PLS READ...boyfriend falls out over smallest things

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It’s my dads birthday tmoro (7th feb) and my boyfriend wanted me to go to his but i said no cause obviously its my dads birthday and i wanna spend the day with him as i work full time and don’t get to see him a lot. I was at my boyfriends last weekend. We both work full time and sometimes after work i’ll go up to his for a couple hours, I was meant to go up last night but i was just far too tired so i told him that nd he was sorta annoyed about it so i asked him if i could come up today which he just replied ‘up to you’ i don’t know about anyone else but when i’m told that it just makes me think that i’m really not wanted (might just be overthinking tho idk) but anyway he started an argument about that tonight and im so physically and emotionally exhausted about the whole situation, im always made to look like the bad person every time we fight. I can feel him distancing himself and even though i’ve spoke to him about it, he still says he’s fine when i know he’s not. I really don’t know what to do anymore. I just need to speak to someone.