help !

I’m bi. I’m talking to this girl but then there’s also this other guy and it’s so much pressure to have to pick Idk what to do the girl is really sweet and nice now but I’ve dated her before and she treated me like shit but I still wanted to be with her so I stayed while she was disrespectful to me and the guy is cute he’s definitely my type but I just don’t want to break the girls heart either cus she’s very sensitive and last time I broke up with her even though she treated me badly she started cutting and I just don’t want to make her do that somebody help me I don’t know what to do