He ignores me on The weekends

Last week my boyfriend (of two years) did the same thing (we had a disagreement and he avoided me... because I avoided him for him calling me out my name)

Saturday came around and he just stops texting me and doesn’t answer my calls or facetime

Why does he do that? All of yesterday and last night we had good conversation laughing and everything he shared with me that he was stressed about something so he FaceTime me “just to see you” and today he won’t answer any of my messages

He has a iPhone what does it mean if I text him and all of a sudden the messages go to him green instead of blue... why does he think it’s okay to do that??? This is hurting my feelings... like I get it he doesn’t like to be avoided... 😔