ok i need pples advice/opinion on this plzzz :(

ok well me and my best friend like this same guy and he likes us both too, but she has known him longer than i hav but shes not honest with him like i am. well there was this concert and he wantd to go wit me and my friend but he lost his ticket so i bought him another one, he was really excited said he would do anything to pay me back. well the payment ended up being sex becuz he wantd to take my vcard and all tht(was still a virgin before then)..., k well when he came down(lives like 2 hrs away frm me and my friend, nt n same town) k well we didnt hav anywhere to do it, so he askd my friend if we could do it at her house, cuz her mom wouldnt b hme. well wit her liking him too, i knew she wuld hav a problem wit jst us evn doin it. k well i love her to death, bt i didnt want to hurt her like tht. bt she "says" its ok and tht shell jst forgt it and let us, bt i kno tht it really bothered her. bt she gets every guy she wants, i mean i want this one guy and she gets sad, she has had and still has many guys, and i dnt get sad. she uses all the guys tho, bt this one guy i really like and i didnt want her to use him, and i dnt lie to him about anything like she does to him, thts one reason y he wantd to hav sex wit me instead of her, bt yet she gets all pisssd off.i mean she culdve said no rite? said no tht we culdnt of done it at her house?, bt she did, and yet she blames me for all of this, saying tht i took this guy frm her....((BTW SRY ITS SO LONG)) i jst wantd pples opinons/advice on wat i shuldve done, or if wat i did wasnt as bad as i thought it was. culd also use sum advice about the guy too plz