<human>: Condense the text into a few key points

My boyfriend (19 M) and I (19 F) have been dating for a year and a half. I got back from a spring break trip last week and it is hitting me more and more how much I screwed up. While I didn't "technically" cheat on him (didn't kiss anyone or anything else), I did cuddle/spoon with multiple guys on the trip multiple nights. When I came back, I casually mentioned this to him, but didn't give him the full details of what had happened. He seemed worried, but dropped it. After a day of talking with mutual friends, looking at Facebook pictures, etc., he confronted me about it and was incredibly hurt. He talked about how it was a huge breach of trust, how spooning was something "we do", and how emotional/close sleeping with someone was. After realizing all this, I broke down and we cried/talked through the whole night. It's been about a week since the original encounter and things have been getting better, but he still obviously thinks about it (as do I) and I know that it hurts him a lot. I'm trying to figure out how to heal this for both of us without sweeping it under the rug. It's gotten to the point that we've considered taking a break, despite the fact that we have talked about marriage and spending the rest of our lives together, although we have decided to stay together and not take a break. The worst part is, I'm not sure why I did this in the first place.
<bot>: Cuddled/ spooned with different guys on spring break, despite loving, wonderful LTR with great guy. WHY??