Where Did My Sex Life Go

So my boyfriend and I have been together for 4 years. In the beginning of our relationship we use to have sex every other hour and once we have sex for 7 hours straight. I never had sex with someone so much before him but he would constantly brag that ( before we got together) that him and his ex would have sex everyday. As the years passed he was messaging several other girls and I started to feel lonely. An old friend had an interest in me and my boyfriend got mad of the thought of someone talking to me like that and that I would allow it when in reality we were talking about how bad my bf treats me. Now we have sex 1-2 times a month if I’m lucky. I want to have sex all the time and in risky places but he doesn’t want it. He says he doesn’t think about it that much and he’s self conscious ( we both gained weight after we got together.) he already knows how I feel and how my vibrator has become my only way to pleasure myself since he doesn’t. He rarely fingers me NEVER eats me out but if I want to suck his dick he’s all for it. But if I have him hard and throbbing, and ask him to get on top to fuck me he will say no he’s not in the mood. I’m tired and I feel like I’m going to end up cheating on him but I love him. what do I do?