I need to know should I continue with him T^T?

Ok so I went on a date with Damien read my previous questions and you'll know he answered his phone after our date and cursed at another woman!I take care of his little siblings and they call me Mamma I dont get why I mean Im not motherly but his mom isn't interested in kids.I want to be with him by his side but he talked to another girl!and I mean she was doing something on that phone!I called him and asked and he said it's a girl he used to date and she's been stalking him ever since..wtf!?Why not tell me I asked he said I didn't wan he to know of you.So now she knows where I live and is watching me through the window she is scaring the Sh** out of me please what should I do about all this!?Ps:Damien is coming over to get her.I just turned around to look at her and she has a creepy face ^O^ she has a knife and is putting it in her teeth im scared.