No desire to have sex with my bf anymore?

I’ve been with my bf about a year (27f and 28m). We moved in together about 4 months ago, and we haven’t had sex in about 3 months. I just have no interest and I’m not entirely sure why. At first, we were arguing for awhile because he wasn’t doing anything around the house when we moved in together. He’s gotten better now, and I feel like we’re in a good place now relationship-wise. So when we started arguing I lost interest in sex. Now we’ve been much better for quite awhile but I still have absolutely no desire to have sex with him. I still masturbate. I’m not sure if it’s that I don’t want to have sex at all, or that I just don’t want sex with him. I’m not thinking about other people and I’m not going to cheat or anything. I’ve been out as bisexual for a couple years. I was contemplating if it might be that I am losing interest in men in general but I don’t think that’s it. I still care for him very much and I feel bad that I keep turning him down. I’m not sure what to do. In the past I’ve gotten like this when I had bad bouts of depression but I don’t feel particularly depressed lately. Advice?