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

About three years ago I dated Sarah. Sarah is Korean and was over here in the US on a student visa.. She's one of the most creative and positive people I've ever met, I think incredibly highly of her. At the time I wasn't looking for anything serious, and when I sensed things getting serious with Sarah I let things fizzle out.  I take responsibility for that - I wasn't upfront about my intentions and I was bad at communicating my feelings articulately (which I feel I've gotten better at, but continue to struggle with)  This was obviously hurtful to her and I still feel guilt about how I handled the breakup.

We saw each other a few times after that at parties and through mutual friends - and we would talk, but not about the relationship.

Now a few years have passed, and she has gone back to Korea. She's been on my mind a lot lately and I have been considering writing her a message. I really miss her in my life. I don't expect anything beyond that, and my goal isn't to get her to date me again, I just want to let her know that I think she's great and I want to be in each others' lives in some way. I also feel like I owe her an explanation and apology about how we ended things - but I'm having a hard time figuring out if it's a good idea. 

Do any of you have experience with reconnecting with an estranged friend or ex? If you were to write them what would you include or exclude?

Thanks!
<bot>: I want to reconnect with an old Ex living abroad  as if we were still great friends and see what comes of that, but part of me wants to discuss the past and I don't know if that would do harm or good.