Ouch!  That hurt!  My condolences.

Thanks for having the guts to share this with us. So many times I lock my blunders away in a drawer or throw the game log out in the trash after a tournament without even having the heart to look over it since I am so pained by the stupidity of my blunder. That is a silly attitude to take, as there is a mine of information to be gained from every blunder, about its causes and potential remedies.

I don't really know any theory on these lines, so the comment regarding ... Bf5 is enlightening. I think black was already in trouble after 12. ... Nxd5. And if black allows white to put a pawn on f5, this is also bad.

I'm a bit nervous commenting on such a painful loss, but in the opening 4...Bf5 is not thought to be very good. White can play 5pxp pxp 6.Qb3 with large advantage. In the game continuation it was very drawish,  until black started playing moves like f5, disregarding the feelings of his white square bishop as you said.

I feel for you, bud.  I don't know how many times in my career I've "snatched defeat from the jaws of victory," but I can tell you its been one too many.

dc1985, I assume you mean 32. Rc7. Sure, that holds the win as well. Of course black can't play 32. ... Rxc7 33. dxc7 Ke7 34. Bb7 when white will win the rook for bishop and pawn and shouldn't have any trouble in the resulting endgame. 32. Rc7  Rd8 33. d7 might also be very good for white.

What probably happened to me during the game is that I was focused on winning the e6 pawn. My rook on e7 threatens to win the e6 pawn leaving me with connected passed pawns. So naturally I didn't want to give up this threat. Black's only defense of the threat is Re8, so I wanted to maintain the bishop's defense of that square. If Bd7 didn't hang the checkmate, it's a pretty good move.

Quite a traumatic loss:(

That looked like a good game up until that final move. At move 32., why not 32. Rc8?