My boyfriend's past is bothering me

My bf(25M) and I(24F) have been dating for two years.

I had been in several relationships before I met him, some short-term and the others long-term. But casual sex was never a thing for me. I had a couple of partners I had sex with before, but only while I was in a committed relationship.

My bf on the other hand, has quite a high body count. When I first got to know I was surprised, but what is bothering me is not the number itself. What's bothering me is that the number of girls he had casual sex with is way higher than the number of girlfriends he ever had.

I know "past is a past". I know he cannot change it. I also know everone has different standards when it comes to intimacy. Also, he never cheated on anyone. Whenever he had casual sex he was single. So this shouldn't make me lose trust in him. He didn't do anything wrong. I know he doesn't owe me an apology. I love him, I know he is a nice and loyal guy, I don't feel like he will ever cheat on me or anything.

I'm struggling because... it is hard to believe whenever we talk about intimacy and he tells me how precious and meaningful thing it is for him to become "one" with his girlfriend.

Like... sex has never been a casual thing for me. To me it is a way to express deep love, a connection between two people who are committed to each other, and so on. And it sounds like he has the same view on it. So I really don't get how he used to just get drunk and bring a random girl into his bedroom if this is true... He says having a mere hookup and having sex with a loved one are very different. So I don't understand why he kept going back to hooking up even after having dated several girlfriends, getting what was truly meaningful and "precious" to him.

In the end, I think I just don't get how he was aware that this thing within a relationship was such a precious and meaningful thing to him, then he kept giving that precious thing to hookup partners who were just strangers...

I've been trying so hard to tell myself all these thoughts are ridiculous for so long, but whenever I try to flip it the other way it just doesn't really make sense. This is just too painful.

I think I wouldn't have felt this way if he had the exact same body count but all the sex happened within serious relationships.

What can I do to survive this kind of thoughts? I would like some advice from people who has gone thru similar feeling and ended up overcoming, or people whose partner went thru a similar situation as mine.

Thank you.