He acts like he doesn't care

Re: He acts like he doesn’t care

I don’t really have a choice. I went against my parents wishes and fought for this relationship, whilst he supported me. Everything was going fine, it’s just now he’s undergoing this sudden personality change. When we have our good days then they’re reallyyy good. When we have our bad days then they’re reallyyy bad. I’m just trying to figure out if it’s normal for guys to change their behaviour after engagement/marriage, or if it’s just my guy who’s the a**hole