Should I tell her?

Last year me and diz girl hated each other… [why]?? because of a guyyy!!! 1st I was datin him but I had broke up wit him bu t I wasnt over him… So her & him started datin… it kinda made me mad how she looked @ me like she was better.. So I flired wit him and finally he askd me 2 go 2 da movies.. So I did she found out and I got over him… And then his bro da 19yr old started trying 2 get wit me! Well we got 2gether stayd 2gether for 2 years.. while I was datin him me & her became kool wit each other..! Then Mi b/f got deported to MEXICO soo were over now!! But me & her are really close now I go 2 her house &everything!! Not 2 long ago her mom let him move in wit them!! I went & spent da night @ her house… we all stayd up late.. and we started to go 2 sleep?? well we all slept in da same bed!! He keep on touchin me.. while she was awake… in between us… I never went 2 sleep neither did he… because after she went 2 sleep he got outta bed and went to my side of da bed!! I started to really freak out [like omg what if she wakes up]!!! I told him like 5 tims go away but he was like [kiss me] so just to make him leave I kissed him…Well the next nite I got drunk on vodka wit my boyfriend and then went back 2 her house to sleep well we went straigth 2 bed… He didnt… but he slept on da floor that night.. and around 3or4 he pickd me mp off da bed & put me on da floor and started takin off muh clothes and suxn on me and then he said ‘’DO you want to FEEL ME’’? im pretty sure I didnt answer his question!! But we had sex.. & the next niteafter she went 2 sleep… I got on da floor and we did it again!!! and 4 more tims while I was there… I she left that next week went outta town wit her dad…I went to her house when no1 was there but him because he askd me to… we did it again!! She came back I went to her house we did it 2 timez and I broke it off wit him… we did it all those times @ her house.. 6 times with her ther asleep & 1 wit no1 there!!! And she calls me her BESTFRIEND… but I dont believe in Friends.. just people you talk to becz you cant trust NO1 BUT your SELF… but I do feel bad And a part of me wants 2 tell her!!! And a part of me says if she was in my place would she tell me??? if I tell her I lose everything!!! it’ll get around MY SMALL TOWN fast!!! I’ll lose my b/f respect towardz me my rep trust thats a lot just so she can lose 2 things me & him What do yall think??