Why I keep feeling blank during intimate moments with my boyfriend?

I'm (20F) my boyfriend (22M) I grew up in a religious environment so yk it was carved in my mind being intimate is bad and avoid it, when I was almost 19 I made a guy friend in real life, and he ended up proposing me, I literally took 1+ month just to give him answer but long story short i accepted and we're in relationship, one time randomly he held my hand and i literally fought with him over it because of my messed up mindset anyways he understood me and took it slow, he used to discuss things on chat first used to make me ready then next day he'll do it, so yeah it's been a real headache for him sometimes he gets pissed off or sometimes he just becomes extremely sad, but the thing which broke him was seeing me going blank during these moments he literally tried everything but i end up feeling blank, he started accusing me that I'm cheating on him with her because I hug her sometimes and we stay close, but he was like you're not comfortable to get close to me but you're doing it all with her (tbh we're friends nothing sexual and i think hugging a girl can't be cheating right?) but at this point he's just wondering do i even love him or not? So can anyone tell is this blank thing happening because of my env? or I'm asexual? or like my boyfriend accuse me of being lesbian lol

Why I keep feeling blank during intimate moments with my boyfriend?
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