hi..the way i see it..(dunno if right).your mate is dating an ex of yours, who you still get on with..now you want to date an ex of his who you get on with, but your mate dont...
to be honest i think this is a very complicated situation..and i do think you are right..you may lose friendship over this either way...so i suppose..are your feelings strong enough to risk losing friendship for love?..

Without knowing anyone involved, you don't touch a mate's ex - especially if he's had a child with her, and especially if they don't get on.

Unless of course, you've got plenty of mates and won't miss one.

I don't think it's a good idea, unless you think he can be happy for you and her...Which I highly doubt.

you sound to me like you know it will go ahead..and if thats what you and Sarah decide to do, then thats great..you understand the risks and emotions that it will cause..thats good too..not sure anymore what help is needed for? sorry

"Go for it!" Will that do?

We're only here for advice. We don't know the whole situation, the people involved or how this could truly affect your life.

If you're going to start seeing this woman, you do need to let your friend know.

ASAP.