Sorry to hear about your situation, but sadly it's all too common. Your W sounds like a classic WAW but I wouldn't be totally shocked to find out there is an OM involved, especially given the history you described with pictures and men asking for dates.
Cadet should be along soon with a post with several links to a ton of good advice. That is your homework. Read every one. You can find the same links in almost anyone's first thread if you don't want to wait. This is going to be one of the hardest things you have ever done.
For now, you need to realize and accept that your old M is over. You have been fired as a H and your W wants nothing to do with you. If you are going to have a R with her in the future it will be in a brand new M. Right now, you need to give her the space and time she is asking for. Do not pursuit her, do not buy her flowers, profess your love, write her poems, etc. None of that is going to do anything but push your W further away.
You need to try and detach from her, and focus on you. Do some serious thinking about your own role in the breakdown of your M and focus on fixing those things in you. That's all you can control is you. Your W needs to explore her own feelings and you need to let her. This is going to be a very long, difficult journey. It will be measured in months or years, not days or weeks. Sorry that you are here but follow the advice given and you will get through this and come out a better man in the end.
Me 47 W 42 T 24 yrs M 18 yrs W living with OM BD1: 3/7/2015 (A with OM#1) BD2: 4/11/2015 (A with OM#2, W moves out) WW filed for D, papers received 9/18/2015. Meeting to determine child custody 9/29/2015.