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

background: so my SO and i have both been open in our past relationships but haven't yet actually explored the swinger scene as a couple. we have been together for 2.5 years and have an amazingly fulfilling partnership, sexually and emotionally. we were both on the same page about how we wanted to take the next step (finding a third participant in the bedroom), had actually agreed on first night rules and planned on hitting a local club this coming weekend. 

the issue: at dinner on saturday we discussed the idea again before heading to a local bar to meet up with friends. we had a lot to drink (just a fact, not an excuse) and were having a lot of fun dancing. i excused myself to the bathroom and as i walked out a female friend of ours kissed me. not the most chaste of kisses, but it definitely didn't go any further than VERY light kissing. well, her husband saw it and freaked out.

the outcome: two days later and apologies have been made all around. her husband apologized to me for his reaction, i apologized to him for my part in it. she has apologized to me and to him. and i have apologized profusely to my SO. he maintains that while he isn't jealous of the fact that i kissed another woman, he is incredibly angry that i violated the rules we had for next weekend. no drinking and no playing with anyone else without express consent from him. i agree that something happened that shouldn't have, and i am definitely not proud of how it happened. i am completely in the wrong, i accept that. i have never violated his trust in any way and desperately need help with how i can start making this right again.
<bot>: i kissed a girl, SO isn't mad that i did it but mad that we didn't discuss first. i want him to be able to trust me again. help?