Why would you start dating again if you were still hung up on a cheater that disappeared on you? On second thought, why would you even talk to an ex you were still hung up on if you were in a new relationship?
Put your new boyfriend on so I can ask him how he feels about you still wanting to be with a cheating douche bag.
Work on your self-esteem, Op. You have none if you'd even say hello to someone that did what he did to you.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion