<human>: Could you distill the essence of the text into 1-3 sentences?

Well..a bit of background info first. We are both 21..My girlfriend has gone overseas back to China she was here and we have been together for 1 year.( so the relationship has gone long distance anyway I plan to be be over there in 6 months for one year exchange with her). 
She is a conservative with sex( more traditional chinese family)and we've never had sex ..she wants to wait till marriage whilst i've always been more 'free' in that sense. Although we have done everything else but actual sex. 
Basically my buddy invited me over to his place for drinks and he brought a couple girls..I thought it would be just me and him anyway we got really really drunk went out and came back to his place to crash. One of the girls was pretty drunk( so was I) and I had to carry her and put her in the bed..naively I decided to sit down for a second on the bed and suddenly she started to feel up my crotch area ..I don't know what happened..it's like my brain just switched into some other mode ..she ended up giving me a blowjob and then I went downstairs and slept outside. 
I really didn't know I could be such a prick .. I can't believe I did that too my gf.. of course I wasn't thinking that at the time I wasn't thinking anything..I love my gf so much and imagine she's the girl I want to spend the rest of my life with.. she's so innocent in some ways if I said this too her it would literally crush her and it's guaranteed to ruin everything.. I really don't know what to do right now..I love her more than anything..anyway ..so i'm here on reddit..
<bot>: Went to friends a house got very drunk and horny and cheated ( blowjob) on my serious girlfriend and feel lost.