My ex and I got in contact after 2-3 months, any advise please?

I say "move on" too, but if you want to wait for her to make up her mind, then that's up to you. Her life is a mess, she say's, but don't you feel like you have to wear that guilt. Her life is a mess because she made it that way by dumping you and checking out her cheating ex. Keep your pride intact because he was part of the reason for all this, so you shouldn't try and get back with her. Take it slow. So what if she thinks you got it all together. That's exactly what you want to reflect, let her sulk a little bit and miss the fact that she had everything going with you and "she" blew it.