Open Question: My boyfriend is 21 and he hasn’t been wanting to have sex. He is taking medication for anxiety could this be y?

We had been together for a year. He had hoped that it all the time. There are few. Every 2 weeks, if I'm lucky. I asked him if he did not attract me, he said, he and his love me. I am afraid that someone else. He thought I would like too, but I do not think too many demands several times a week. I think that the 21-year-old man can go. Please give me your comments and ideas to try to remedy. I am a bit old (30), but I hope that younger than him. He is, if this is his desire may be effecting anti-anxiety meds, I want to know.