My bf kissed my sister when he was drunk... What should I do and if it leads to breaking up how do I do that?

Anonymous
So I had just gotten my wisdom teeth pulled out and was on antibiotics... I figured it wouldn't be wise to drink with my sisters and our friends, which just happened to include my bf. Now he's told me countless times he cares anout me and wouldn't ever hurt me... I'm a skeptic in most cases regarding pretty words like that, but in this case decided to believe him.
Anyways, my little sister was with them all and she is very innocent for her age, which makes most of our friends protective of her. This time I don't know what happened, but a "new" member to our group was invited and ended up kissing her. Given that this was her first kiss and really special to her she freaked out and started feeling bad about it. My bf took it upon himself to take care of her as I was currently out cold due to painkillers. He was talking to her trying to calm her down and for some reason he thought kissing her would... It sounds bad and it is, but anyways it was a peck and she was so shocked she stopped crying. Now my bf is typically a good guy and thinks of my sisters and his sisters, though you wouldn't really kiss your sister. I don't understand why he would do it, other than being really drunk & possibly rolling.

I don't know what I Should do. He told me a week after it happened because my sister felt that I had every right to know & well I did. When he told me I wasn't that surprised.

We have been dating 5 months & there haven't been any real problems between us before. He is my first serious bf & well I do like him, but I don't know if he deserves for me to remain with him. If I do then I feel like I should change a few things & well I won't trust him like I used to.

The sad thing is that his ex cheated on him, but far more drastic & he knows how it feels. He feels a lot of remorse, I can see that, but that, alcohol, & posibly drugs, doesn't excuse the behavior.
My bf kissed my sister when he was drunk... What should I do and if it leads to breaking up how do I do that?
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