How to rebuild intimacy?

L

This might sound weird but it’s not that I don’t feel attraction towards my boyfriend anymore but I do not feel like having sex with him. I get horny but it’s like I don’t want to pleasure him anymore, I used to give him blowjobs for fun and want to have sex with him all the time but now im so uninterested. He’s been the only one to initiate the sex, I don’t do it anymore. If it was up to me, we’d probably be going months without sex.

For the past 3-4 months we have been fighting alot, lots of unfaithfulness happened and yes I still love him but im thinking all of this was caused by that. How can we rebuild that intimacy? He sometimes falls asleep on the couch or in the other room and it really breaks my heart. We can’t really take a break from each other because we live together, I really want to move past this and be able to enjoy sex with him. To me sex is fun and enjoyable, I just want those positive feelings around sex to come back.