<human>: Condense the text into a few key points

I've been friends with my best friend for almost 3 years now, we've lived together in school and we've always gotten along great. This year we've grown somewhat apart because we don't live together, and we just sort of stopped talking as much.

His ex gf had been dating him for 3 years and being his best friend I also became very good friends with her. They took a break last year, where I coached them back into their relationship. They're on another break right now but this one looks much more serious. I've been in contact with both of them through the whole thing since they're both my good friends, and honestly I'm siding with his gf because he hasn't been treating her right.

It's been about 2 months of them being broken up, and I'm afraid I'm starting to get feelings for his ex. Is that wrong? I don't want to lose him as a friend but it's fairly obvious me and his ex would be a great couple. 

I'm purposely not using names and a throwaway because he is a redditor as well and that would be awkward.
<bot>: My best friend and his gf of 3 years broke up 2 months ago, and I'm starting to have feelings for her. Is it wrong? How could I work this to keep my best friend too?