Soo Confused, Sexuality..& Pregnancy

Well I’ve been with my girlfriend for 7month now. I must admit I’ve cheated on her so many times and I feel so bad. and I know drinking is no excuse but it always happends when I drink. but because I have been single for ages and im one of those people who like to go with the flo and single ready to mingle it still hasnt kicked in that im in a relashionship, im bisexual and she’s full on lesbian but thing is im confused to what I am I have no idea, her mum thinks im just experimenting my parents dont know only a few cousins and my gran but I dont want to say anything until I no for sure and couple of days ago I cheated on her again with my cusions bestfriend… unprotected sex and it was during my period. usualy im very carful but I didnt really think of anything we toke that risk, and now I feel real bad and stressing over the fact am I pregnant , will my girlfriend find out who I love.my girlfriend sometimes scares me of talking about marriage and everything shes too jelous but she lives too far away in lowestoft I live in london we get trains up and down like every month. shes on about moving to essexs to be closer, but sometimes I just feel lonley because my parents and sisters live in france it just feels like where ever I am some ones always far away who I love and I want to be in france permently but I dont want to leave my girlfriend I just dont know what to do???