I was in a 2 year relationship, she cheated and we cut all ties. Should I ever expect her back in my life?

Why would you want too? Clearly she didn't love you enough to respect your feelings and emotions. Lets face it, you were the rebound guy on yourself. You know, the guy you lead on and hook up with several times after a break up until you get the next steady boyfriend. Not only did she cheat on you, but then she used you until the next guy came along.

Forget about her. She'll never love or respect you the way you would want a woman to. There are way more eligible girls who would treat you like a prince just like we would expect you to treat us like princesses. "Get back on the horse"- In this situation I'm going to say "Get off of her horse, and find another."

Good luck.

you have to move on and it's hard, it's only been 3 weeks- she might come back but you got to be mentally prepared.
i myself can't take anyone back after they've cheated-it was ok for them to have sex with someone and to me means I don't mean much to them at all-if I loved them, that would hurt me and I won't look back
for a while you will be thinking 'what if...we were together etc' that's normal-
but be aware of the facts
she's the one who jeopardized the trust in this relationship-looking at it from a non emotional perspective-if I was the guy, I'd have trouble trusting or investing my time in someone who's shown how fickle they really are
permanent means you don't think of her at all
for me, it took me a while to get over one of my ex bf's but now I'm free from wanting to be with thema nd grateful I can meet better guys

Trust me. They always come back. Even if its not for the right reasons. For example, she gets a new boyfriend and they get in a fight and she contacts you for support. She'll eventually contact you when she needs something.