My boyfriend isn’t interested in sex

Me f26 and my boyfriend m33 have been together for 5 years, sex was always good up until the 5th year. sex was twice a week and then once a week and now 2 times a month if I get lucky. I enjoyed giving him head and would do it without him asking for it and he loved it but he never returned the favor on his own I would have to tell him every time and when he would it seemed forced, It wasn’t like this before he would actually eat me out with passion and there was foreplay and now just straight to sex. I just moved in with him 5 months ago, I’ve been rejected and honestly I’ve given him the benefit of the doubt because he works hard and I know many times he’s tired but I have tried other days when he’s rested and nothing. I’ve communicated this issue plenty of times but always end up arguing. I really doubt he’s cheating and I know he had porn addiction maybe he’s back on that. He did seek therapy so not sure if it worked. Overall he’s a great guy smart, hardworking, generous, and very loving. but this lack of sex is killing me and I’m getting tired of this, cheating has crossed my mind so many times but that’s not In me and leaving him saddens me because I do love him. I’ve questioned him if he’s still attracted to me he just says of course. What should I do?