You should do the following things, in this order:

1) block him from communicating to you
2) never think about whether he is hurting, why he did what he did, his motivation, his train of thought, and his diagnoses. You won't get anywhere thinking these thoughts.
3) you are completely done with him as he told you that you deserved to be molested and that completely rules him out of consideration forever
4) attractions are irrational and idiosyncratic and not based on looks alone and it is very common that someone would leave a more attractive partner for a less attractive partner, so you should not try to win him back by plastic surgery, because it would be. 1) ineffective and b) even if effective, detrimental to your wellbeing. So if you have money put away for plastic surgery, buy a CD to make the money unavailable to you for right now.
5) get a pen and paper or open a spreadsheet and make a list of your sacrifices. You said that you gave up everything for him. So make a list. Think carefully and remember every detail
6) from the list in (5), extract the names of people with whom you lost contact and contact them in order to recover connections, one person a day
7) finally, you should realize that there is a difference between things that are. And are not within your control. You cannot control his behavior - if he wants to be with another girl, you cannot prevent it from happening. But you can control your behavior. If he wanted your facebook password, it was within your power and control to realize that he is abusing you and stop seeing him. Do not ever give your passwords to anybody.