Aw honey - sorry you are still in that stuck place.

I've got a couple of thoughts about your post:

A) He "has" to send her flowers and fly to meet her for Valentine's Day? Really???? That's so incredibly lame. He's doing what he wants to do and trying to soften the blow to you by claiming he has to do it so she won't off herself. Do you hear how ridiculous he is?

B) He's never going to miss you until YOU'RE GONE. Right now, he knows he can have you if he wants you, and he's still dithering. OW looks more attractive because she's gone. You need to be the one moving on. He has to start worrying about losing you.

I'm not saying you need to date or anything. But he needs to worry that you will. He needs to worry that you're gone.

OR - I've said it before, I'll say it again - you're young, no kids, and you might need to accept that he's no longer the man you once knew and probably never will be again. Nothing wrong with moving forward with your life if you want to. You've done enough.