My ex-girlfriend seems to want to talk to me>

Well my ex-girlfriend seems to be trying to contact me (she talked to one of her old friends that we both knew from high school and the first thing she says is asking how I'm doing and if she has talked to me) and I'm tempted to talk to her again but I feel like something might happen plus she has an ex-alcoholic dad who is very angry and protective and I currently do have a girlfriend so what do ya think I should do? (though I have a feel of what your going to say)