Search Results: guilty over break up

So my ex and I hit that 4 month mark. Well after back and forthing with him I decided to completely ignore him. IN Which He Got Angry. 3 or so weeks ago he told me he misses me, our closeness, stability, how we made love and didn't just have sex, and our possible future. We actually connected again and etc . During the 4 months he has been drinking off the wall and having sex with way to many girls. Even tried to with me in which the answer was NO. Well now he's made it very obvious that he is dating a girl who is from his hometown.(thousands of miles and an ocean away). I don't necessarily care if he dates we aren't together. But he has made it clear that he still cares and has feelings for me, but hasn't decided what he wants. He has also made if clear that he feels I guess guilty or embarrassed about how he's acting and the things he's been doing. And that I will love him less because of it. I'm not gonna give you this crap that our relationship was perfect cause it wasn't. But we were in love. Powerful love. I still very much love and adore him and do believe he and I connected on a level like no other. I'm wanting to know a few things. Is he serious about the whole missing me thing or is he just being an a$$? ( he said this on a different occasion then when he asked for sex). Is he just testing the waters (rebounding) with this girl or there no coming back? What generally would be going through a guys mind at this time? Should I completely let go or hold out a little longer?
*We split cause he needed space. And eventually we just broke up. He says didn't want it to be over which he said on multiple occasions