<human>: Give me a shortened version of the text

So yesterday I get a friend request on facebook from some girl I've never met. Right after accepting it to see if we have similar friends she messages me to say that her mom is dating a man she thinks might be my father. After a few messages back and forth sure enough it's the real deal. She mentions that he seems like a great guy who really feels like he messaed up in the past and misses his kids terribly. She says she's just trying to help because she lost her father in a divorce years ago and thought I might want to meet him again. The whole reason I haven't seen him in so long is that he was doing lot's of drugs and went apeshit crazy and scared my mom when I was about 13 and when they got divorced he kept violating the restraining order and threatening her. We went into hiding for 4 years after that and lived in a battered and abused women's shelter for a while. Fast forward to now- I am almost 30 years old, a grown married man with a child of my own, with a house and a life. Needless to say, I have no idea what I am getting into. Part of me wants to leave that door closed because I haven't needed him thus far (what if he's still an addict and a total loser.) The other part of me wants an apology, though not excuses, and maybe to see what he has done with the last 15 years. I hesitantly told her I would talk to him on the phone and she's going to give him my number to call me tonight or tomorrow. So what do I do, say, or ask?
<bot>: Haven't seen my dad in 15 years cause he F-ed up his life with drugs and I'm going to talk to him soon. Where do I begin?