IMHO If you honestly think after reflecting back in the relationship is that he is the ONLY man you can or could ever love. That the relationship was the best one you think you might ever have. And you cannot imagine yourself with someone else.Then stand.
I've been in love exactly twice: once with H, and the other with my gay best friend while we were in college.
How I know that I was in love is because I did not find either to be attractive at first. (Actually, I only hung out with my gay BFF to get to his roommate, who I WAS attracted to.). It was only after much time spent together that I started finding each of the two "hot."
Since the gay BFF thing was NEVER going to happen, that leaves H as the only man I've ever loved who also loved me back. And, the relationship was the best one I've ever had - the only one, in fact. So, no...I don't want anyone else, and can not imagine myself with anyone else.
Thanx for helping me answer this question! Bring on the naysayers.....