First for some context:
Ive been an RP lurker for about two years now. Reading all of the material in the sidebar and then frequently reading posts like Fields reports and such, trying to learn as much as I can. I can say have been implementing The rp way of life into mine for real at least for this past year and I´m just recently starting to see the results.

Now for the subject at hand:
I Recently went on a trip with several members of an engineering group I am part of in university. On this trip with us was this hb8 who is part of the group and is in an LTR with a close friend of mine from university. Now I assume all of you know where this is going. See, i had never thought of getting with this girl due to the fact that she is my friends girlfriend and never really gave much thought after that, basically she just wasn't on my radar for sexual purposes. Well during this trip we got to talking and went out partying several nights in a row. With each passing night it became more and more obviously we were into each other until last night, the final night of the trip, where we ended up fucking. Now right after it happened i wasn't feeling much of anything but now that I'm back home and back to "real life" in a sense, this feeling of guilt just keeps getting stronger.

I'm not sure if this is the beta in me that refuses to die and i should just ignore it. I really have not had much experience with this type of situations. Any advice?