What have I lost interest in sex with my boyfriend?

We don't have sex often which frustrates him. After the pregnancy scare, we continued to have sex but I slowed it down. I lost interest in sex. The last time we had sex was days ago because he complained we weren't having enough. We hadn't had sex for several weeks. I was on my phone keeping track on days we had sex for my period and got a flash back of the pregnancy scare we had.

About a few months ago, I had my first pregnancy scare with him. It went on for several weeks. In the beginning, he was there for me and still continue to have sex with me during it. He would even lay on my stomach. In the middle of it... A few days out of nowhere, I stopped hearing from him. I texted him all week multiple times a day and he would barely answer and wouldn't answer his phone. In the middle of the week, I sent a text threatening to keep the baby and us breaking up. We both agreed to not keep it if I was pregnant. He finally texted back that he didn't want me to give it up anyway but that was the only text he sent. The last day of the week, he finally calls me and has a normal conversation with me. He mentioned he's been busy all week and had no time for me. So I mentioned me still feeling sick and it made him angry and told me that I needed to take another test cause it's scaring him then hangs up. I tried calling back several times but no answer. So I ended up getting my period. I didn't tell him tho. He finally called me a few days after the week but this time didn't say he was busy, he was stressed. He wouldn't give a full explanation but was texting me sexually things.

I let it go and just took it as he was stressed. Fast forward, months later we are still together but completely lost interest in sleeping with him. Ever since I got the flashback about the scare, it scares me. When we argue I hold this over his head and he tries to find something I did wrong to him (which I never did). What should I do?
What have I lost interest in sex with my boyfriend?
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