Guy's Behavior

My boyfriend doesn’t give me any reassurance?

So my boyfriend has messed up in the past. So when he goes and does certain things I like him to reassure me that it’s not going to revert to the past. When I ask him to reassure me that he will be respectful of our relationship he just gets annoyed saying the past is the past and he’ll never reassure me anything.
He just says “here you go” and “I dont care”. It doesn’t happen often but last year he went to Vegas for football and had one of the football girls stay in his room. I found out through his friend. So he’s going to Vegas again and I’m asking him to not repeat the past and to be respectful of our relationship because I’m not sure I trust him to not get a girls number or not talk to women. He just says omg here you go and he doesn’t care and if it’ll make me feel better then whatever.

Why is it such a big deal? I don’t understand. Just says yes babe it won’t happen again or yes babe you can trust me. Why is it so hard.
My boyfriend doesn’t give me any reassurance?
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