<human>: So, on Monday my girlfriend of 8 months broke up with my. My best friend's ex, who he only dated for a month (July 1ish - August 1ish of this year), asked about the breakup after it happened. We haven't stopped talking since then, and I'm starting to get feelings for her, and she said she's starting to get feelings for me.

My friend asked what we were talking about on Tuesday, and I honestly answered. He said he was okay with it. But, this girl wants to make plans with me for this weekend. I don't know if my friend would be okay with that.

He broke up with her because he was interested in another girl. Their break up was fine. He dated that girl for a while, but just broke up today.

I was going to call and ask him if he'd be okay with me and his ex hanging out over the weekend, but now I'm not sure if it's a good idea. I like this girl, but value my friendship with my friend.

Also, he and the girl I'm talking to did not have sex. I feel like that's important to mention.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: I'm talking to my best friend's' ex. He mentioned he was okay with it, but broke up with his new girlfriend and now I'm worried about asking him if he'd be okay with me hanging out with her.