Moving On?

So this is a long story ... A few years ago I was really into this guy but he didn’t like me so we decided to just be friends. A year or two later I guess he was into me but I didn’t really want to be in a relationship at the time. I told him if he really liked me he would wait until I was ready (this was also a way for me to see if he was serious) he waited for me for about a month and then he was in a relationship. During this relationship he was flirting with me and telling me he would leave his girl for me. I declined. We stopped talking. A few more months later he was single and we became friends with benefits. He then asked me out and I accepted but we didn’t date for long. Because it seemed that we were better when we weren’t a couple.... fast forward a year.... he was realllllllly into me and asked me out multiple times and I told him I would accept on the condition that we could be “low key” he said he didn’t want that so I told him i couldn’t be with him. We continued to flirt and then stopped for awhile because he got in a relationship however I was jealous and upset because of this and he got mad and stopped talking to me because he thought I only liked him when he was in a relationship ... Another year goes by and he asks me out again I again decline however we were friends with benefits and always flirting... fast forward to now... so now he’s in a relationship (which he seems to be happy in) and has been for months and he has not talked to me. I try to initiate conversation but he basically shuts it down. I am super jealous and I really want to just at least be friends because I really miss him. So I guess my question is should I tell him how I feel or move on because I had my chance???? & if so how do I move on?