self pleasure is better than sex?!

So I've been with my BF for 6 years at first he use to make me squirt and orgasm all the time. Now 6 years Into the relationship it's extremely hard for me to orgasm when we have sex. Through the years I have always liked pleasuring my self on my own, it's easier. Always have liked it since I can remember. I can always make myself orgasm 3 times!!! But he can't manage to do it for me....even if I play with my clit it's hard to orgasm. He has gained weight and I really think it's his belly and lack of physical appearance. I myself have a couple of pounds on me but I focus on keeping my body in shape as much as possible. The thing I can't figure it out is, is it the belly and apparence that's killing it for me or am I just over him? Or did I rub myself too many times? Lol I love him. I'm not in love with him tho not like before where he was my number 1. I don't care to date anyone else either he's my sons dad. I need some advice ladies