<human>: Last weekend, we(me, my boyfriend S, his friend J, Js girlfriend M) took a few days off to go backpacking through the wilderness. We sorta know each other and S and J have been doing everything together and one of their hobbies was camping, but we havent really gone as a group with all four of us yet.

It was the second night in, we had hiked a very long distance, and were feeling proud of ourselves. J said he packed just thing the thing to celebrate, and he brought out a whole bunch of vodka. We figured why not, lets do it. Im not sure who started it but we were all feeling pretty aroused at this point. S was taking my clothes off and I cant remember the details but then I think we all had sex with each other.

The next morning I woke first, and I saw M had moved over to our side of the tent and was cuddled up to S, and S had his arm around her. I was feeling a bit jealous at this point but I figured I was overreacting. M and S woke up a bit later, and M was still flirting with S, touching him etc even though I was right there. 

I got really mad and ignored them for the rest of the trip. S said he wasnt going to interact with me if I kept being so unreasonable. When we came back home I thought I was being a bit too crazy and tried to win him over again. But I still feel really jealous over the whole thing.  And no one else thinks its a problem... they all think we had a "rad" time and are planning another trip with the four of us! =/

Summarize the given text in a few sentences.
<bot>: After they had sex, M is doing things to S that is really making me jealous. I dont know what to feel.