My ex boyfriend has reluctenly agreed to meet up with me to clear the air, now what?

I made a post earlier regarding another aspect of the situation but have since asked him for this meeting.

Story: My boyfriend of a year and first real love broke up with me 3, almost 4 weeks ago. He said our relationship was really great but when he went away for two months (the first time we had ever been apart for more than a few days) I became "needy" and " too desperate" he couldn't deal with it anymore and broke up with me. I have been devastated and can't get over it. He did it through a message and I feel like I have no closer. We work together and he will soon he will be returning after the two months off. ...So I asked him to meet me in the name of trying to make things as not awkward as possible for the work environment, even though they will still be in some way... When I asked him to meet up he asked if it was "some kind of play" to see if he had made a mistake...I told him it was just to "clear the air and be cool."... He knew I wanted to try and get back together right after the break up, but he said no and this text asking him to meet was the first time we have been in contact since it happened... He responded right away when I texted him and was cool in tone but not mean. He acted like he didn't want to meet but he did agree without much/any push...the only problem I have now is I'm unsure of how to proceed when we actually do meet. I want to try and clear the air and be friendly but also get answer and maybe see if he would be open to trying to work things out...I just don't know how to get this all across in one conversation, where and how do I begin and how do I work all of it in.

I don't want to be pushy and I'm even expecting him to say no when I ask if we can give things a try but I feel like I have nothing to lose by asking, after all I've already lost him...I feel like I have too many goals for the conversation and I'm just going to confuse him or maybe even p*ss him off, but all of it is equally important to me to talk to him about...advice on how I can achieve or possibly crash and burn?
My ex boyfriend has reluctenly agreed to meet up with me to clear the air, now what?
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