How do I deal with dead bedroom life?

I (19M) have been dating my boyfriend (21M) for over a year. At the start of our relationship, we were both very horny and had a lot of sex. However, our sex life eventually began to decline significantly. It started with several instances where he would initiate sex, but then fail to follow through after I had already finished my prep. I was visibly upset during those times, which stemmed from my own feelings of insecurity.

After this happened a few times, he stopped initiating altogether and told me he was struggling with performance anxiety. I’ve tried talking to him about it, but those conversations haven't been productive. He usually just gets defensive or upset with me.

It has now been over five months since we last had sex, and I’m looking for a way to improve our situation.