I like her but she has a boyfriend
So basically me and my ex broke up 7 months ago and this girl came in as my friend after the brake up. We became best friends and talked and flirteded a lot. Well about 2 weeks ago we admitted to each other that we like each other, one problem she has a boyfriend, me and her hang out and talk to the same people we hang out a lot and see each other on the weekends we have kissed(I know its bad). So two nights ago I decided to tell her we can't be like that anymore because were not going anywhere... she agreed and told me that she really likes me though. When I thought it was over... the very next day the flirting started alll over again my feelings came back up. She even gets mad at me when I hook up with other girls. I NEED HELP ON WHAT TO DO PLEASE