If you want some advice on what you should do - that easy. Focus on yourself. You’ve been hurt terribly, and even though “Tom” has proved himself to be a complete sack of shit, it still hurts. You cant control what he did but you can control what you do now.

I’d try and avoid him at all costs for the next few months. Ask your friends to let you know if he going to be places and then don’t go there. This is to protect you. 

Next bit - focus on doing things to replenish yourself, physically and mentally. Your are responsible for your own happiness. Get to the gym, take up a new hobby you’ve always wanted to do but never had time, hell if I was you I’d sell everything I own, pack my life into a backpack and go travelling for a year or two.

Look at this as an opportunity to find out who you are. 

Fuck that guy.