Cheers mate. Was chatting to JD about it last night, we've been having similar things go on with our respective relationships this whole time, and both have more or less ended up with the exact same thing happen on the "wait around and we'll have another go at it LOL JK" front.
Just feel absolutely gutted. She admitted it's been going on quietly for a fair while (i've had my suspicions but she's always denied it) and from the way it all worked out, i don't think she'd have ever said anything unless her mate set them two as that "as a joke", then she had to come clean. I wouldn't mind so much if she'd just told me straight up when it first started, or if it wasn't with the kid in question - he's an absolute bellend. We always used to joke about him and how she said she felt sorry for anyone he got with (he refers to girls as bitches - seriously...)
We had a chat about it last night and she had the cheek to get all pissy about the fact i was pretty cut up about it. Made it perfectly clear there's now no chance of there being an us again after he's had her, and she's been back-pedalling pretty f**king hard so i can only assume she's regretting her choice already.
f**k her though, she's made her bed and she can lie in it.