<human>: Can you succinctly summarize the text in 1-3 sentences?

We met in June 2008 and broke up in May 2012. It should have come far earlier--she was mentally ill and I was unprepared to deal with that or myself. We were a codependent mess, and the good news is that I'm a much stronger/happier person for having learned from it.

A few things have happened lately, though: I saw her on Tinder when I was out of town and looking for anybody friendly to talk to, and we texted for a bit. And then when I got back, I saw her on OKC.

Her profile's great. She's intelligent, creative, funny and writes well. She's an improved version of the person I developed feelings for 6 years ago. And to be clear, I have no interest in ever dating her again.

But I harbor guilty feelings--I didn't handle things beautifully during the relationship or the breakup. I doubt we'll end up talking about this, though. There's no use. But I mostly feel guilty because the way I came to view our relationship and the resulting breakup was such a huge moment in my life. And not only could I not be the person I've managed to become without that trauma--scores of people I've met since then know that story in which she figures as my bipolar or my black ex.

We've been emailing for a bit and are meeting for drinks tomorrow. I hope at some point we can completely disregard the fact that we spent so long together and be friends. And though I'll say this, I know enough not to make that the focus of the conversation. But otherwise, this is a novel situation for me. Little help?
<bot>: Together for 4 years. Meeting for the first time since she moved out 2.5 years ago. What should/shouldn't I talk about for best chance at becoming friends?