FWIW - I thought Amanda's comments were quite amusing
because let's face it, this is a totally ridiculous situation.
Over time I think There you have built this barely-acquaintance into some sort of mirage/fantasy. You have had no reality with this man to speak of - it's the equivalent of seeing someone through a train window or some stranger holding the door open for you, then imagining it is the love of your life.
As for the When Harry Met Sally email, dear god, please NO. It's unfair on yourself (prolonging the agony, unfair on him and her so so much.) Let him go. Let him enjoy his wedding day without some very odd email sent just before, let him be loved by the Love Of His Life (his future wife, not you.) Please don't say you love him more than her, that is mean.
An old friend/ex came back into my DH's life - he was very open about it, she came here for a meal etc, she emailed and texted him continuously, kept wanting to meet him for a drink. I got the sense she thought she could win him back over me. Stupid woman. My DH (who is a bit dense at times and didn't realise she was coming onto him with her bombardment) had to be told what I thought she was doing, and I let him handle it himself with no ultimatums from me. She made a right fool of herself and DH extricated himself and stopped answering her texts and emails so her stupid behaviour lost the casual friendship they had.
There put him out of your mind, he has never been yours. Look forward not back.