I could ask her not to come around anymore....

So, I had a fling w/ an Aqua, and it ended w/ him going back to his ex and me having to deal with the fact that I have strong feelings for him. We were/are friends, and I knew his ex when they used to date (not very well, but knew of her). So of course, I have to put on a happy face whenever I actually see the two of them (which is fairly often). But it kills me everytime, and all I can do is deal (him and I are neighbors btw). So, I confronted him and told him how I felt. We talked briefly. He said that he understood, and told me he could "ask her not to come around anymore, but she probably would feel bad about that." I would never ask him to do that...I know how much he cares for her, and I could never ask him to just go stay at her place because...well...he has his own place. He asked me how do we fix this? I said the only way to fix it is for me to let go and move on. He admitted that he wasn't sure what was going on w/ him and her, and was still confused. I believe that to be true, but if it looks like a duck and sounds like a duck...it is a duck. I.e., they're dating and sleeping together (I've heard...he lives on the floor above my apt.). He said we'll talk more when he got back from out of town, but who know when or if that will actually happen. Anyway...two questions:

1) Do you think he really meant it when he said he would "ask her not come around anymore," or was that some kind of game or test or trick or something (I know Aquas feel misunderstood all the time, and I just don't want to misunderstand him...but at the sametime, we can't forget that he is a MAN! haha) That response kind of caught me off guard because that's just not something I would ever expect him to do, nor would I ever ask him to do so...she's a good friend of his and a good person and it's not fair to her, you know.
2) Any suggestions on how to move on from this guy and still, at least, be cordial? *sigh* Life sucks sometimes :-/

It's really hard trying to be fair, and at the same time, acknowledge/embrace my own pain and anger and disappointment with this whole situation. Even harder because we are friends, you know. Part of me wants to give him my ass to kiss, the other part says "you can't do that because you both were involved and you need to take responsibility for your actions." I still think "f*ck him," though hahahahah...boooo :-)