That was a bad river beat for you, but in that situation I just look at it like this. You were up against QQ pre-flop (with no overcards). Therefor you were in rough shape. On the flop you got extremely lucky to take the lead. He got two running diamonds to get lucky and win. That's all, you out-drew him on the flop, he out-drew you on the river; really isn't that hard of a beat.