so long story short, a friend i used to be close to cut me out of his life about three years ago. now all of a sudden he has been contacting me via phone, text, etc. he keeps talking about hanging out (or specifically "doing lunch"). if i post something on facebook, he's first to reply; and if i ask for advice on something, not only is he the first to give it, he insists that he's "the guy" to go to if i need help. he hasn't mentioned what happened at all. in fact, he's acting like it never happened.
has anyone ever been in a situation where a friend who more or less turned their back on you wants to reenter your life? if so, did you let them?