I like to masturbate alone more than sex with my boyfriend

What does this say about our relationship to you guys? To me sex has little to do with love but after reading articles it might have to do with how attractive I think he is. But during my our first year of dating we had a very healthy sexual relationship. Now it's like my body has adjusted to him and I don't feel anything during sex. Oral works out but I have to go to great lengths in my mind to reach an orgasm to the point where I'm just wishing I could just do it. And when I do it alone it feels so much better. I don't understand how we lost what we previously had.