Search Results: flirting with someone in front of him

So there's a guy I really like that is gay, (So its not like I have a crush on a straight guy deal) and I have asked him out twice, the first time he was dating someone and I didn't know it so its my fault there, the second time he told me he wasn't gonna date for a bit but the next day he started dating someone. Its really getting on my nerves because I like him soo much but I don't know if when I tell him he's going to shove me away again. Im the kind of person who stays with the person they're dating no matter what, no cheating, no flirting with anyone else, not even so much as a look.

If you were to look at him and me next to each other you'd think you were looking at both sides of a broken mirror, he's the complete opposite of me in personality but exactly like me in body build and everything else. So I guess what im asking is that I like this guy and should I tell him how I feel? I would really like to be with him, to the point where I feel giddy just thinking about it, I would promise him up front that no matter what I won't leave him, I don't feel embarrassed around him or anything. Should I tell him or no?