Oh lord.
Your friend is in deep trouble now.
It goes like this. Got over that girl and was kinda ready to move on. I asked another girl I like out and she agreed.
I was kinda optimistic about it, even though I don't know the other girl that well.
The very next day, I meet the first girl and we have a very nice conversation for a couple of hours. Like I said, we are good friends.
Next thing I know, she tells me that she decided to change her mind about having a relationship. She says it's complicated but she had time to think and now likes the idea. I ask her if she is sure, and she says she is.
Good lord. Yours truly considers his possibilities for a moment. The choice is between here-and-now and something that is unknown and uncertain. Never been in such a situation before. I chose here-and-now.
But this creates a problem. What do I do about the second girl? Her friend told me she's quite fragile emotionally and I need to do something so as not to appear a huge asshole. I believe my best choice is to tell her the whole thing and compliment her, saying that I didn't choose the first girl because I think she's less charming. This could still hurt her, but I think she could take it and I can't think of anything better to do.