2nd chances?

When do you know if a person really deserves a 2nd chance, after they messed up soo badly.?

After 13 years my "father" decides he misses my brother and I. I put the quotations around the word father because he wasn't really one. He left my family when we needed him most.I'm torn between trying to have a decent relationship with him and just ignoring his attempts. There's one thing in particular that is holding me back. He left once already, he could leave again. He has another family, so why reach out after soo many years?There are a lot of unanswered questions that keep going through my head.

The fact that he left messed up any realtionships with males. I have really bad trust issues.When I get close to a guy the one thought that is constantly in my mind is "he's going to leave". Once I get to that point i usually break it off with the guy.it's bad, but something i have to deal with.

I'm going to just put myself out there & see what happens. At this point it's the only thing i can do.