like a drifter I was born to walk alone

[DonH]

Just have to chime n here but some of this with FF and new GF seem so obvious to me. First off there is no way you can know that this new 23 year old is "perfect" for FF. There is no way they could even know that - you're just making yourself feel bad thinking about it. Sure it may seem that way but even your D just said the OW that came after you with your X is not living a great life, yet you thought ex found his perfect match after you. So at this point FF is just dating someone new. That's all we can know for sure.

I'll then take it a step further - and this is actually a bigger point. If, and that is a big if, but IF this new girl is perfect for FF then it is totally clear that you and he were never a match or perfect for ach other. You are such a different person than this girl. You have life expierence, parenting expierence, a career, education, on and on. The differences between the two of you are vast. Not saying she is worse or anything but for certain different. If this is FFs perfect match you would have been dating below your bar. For sure it shows in just how different places you two were. That's just the truth. About the only thing you and new girl may have in common is you are both pretty. Otherwise it's no contest.

I hope you'll give that some thought.