Irrational fear of being broken up with / ghosted after sex?

I (23F) think it’s irrational for a few reasons: a) we’ve been together 5 months and if he only wanted sex, he could’ve done it sooner with someone else for a lot less hassle (everything that could get in the way of us having sex has got in the way lol), b) he puts in effort to spend time with me in non-sexual situations, c) early on in the relationship when we were sexting he had to pause it to double check that I wanted a relationship because he didn’t just want a hook-up, d) we’ve done so much other than penetrative sex that if he just wanted to cum, he’s done it plenty. For context, I have also never had PIV sex with anyone. He has been my first kiss, first date, first relationship, etc.

Before him I had a “thing” when I was 14-17 years old with a girl who isolated me from my friends and blackmailed me into sexual acts with her on the basis that if I didn’t, she’d leave too. I’ve since got my friends back and haven’t talked to her in 5 years. I think this adds to / is the cause of my fears.

However, I don’t think he could do anything to make me feel more secure. We talk about the future, he tells me he loves me, he goes out of his way to help whenever he can. He’s so caring and I feel so safe around him. When we aren’t together we message each other throughout the day (not non-stop, just what we’re up to). I also can’t keep my hands off him. It makes me feel stupid that I’m scared about this. When I talk to him, all these fears go away and it doesn’t even cross my mind to have a conversation about it.

Am I being dumb? Is this just cold feet before having sex for the first time? I need an outside perspective.