No sex

Before my son was born (he’s 14 months now) my boyfriend and I had sex almost daily. Even after he was born we still had a pretty active sex life but the past few months it’s non existent. I’ve already brought it up to him asking why he doesn’t want to and he just says he does. He has always been to one to initiate things and so even tho I’d like to, I’m hesitate for fear of being rejected. I have no reason to think he’s cheating on me and I trust him 100% but a friend said if he isn’t having sex with me he must be having sex with someone else and now I can’t get that out of my head. I just feel so unwanted but don’t want to keep bringing it up so that it becomes a stressful situation. Suggestions? Anyone else go through something like this?

Edit: my son sleeps in his own room and has since he was 5 months old. None of our kids sleep in our room.