MP2 had both a str8 and flush draw on the flop giving him 15 outs = 0.85:1 that he'll hit one or the other in 2 draws. He hit the str8 on the turn and then the flush on the river. If you hadn't already volunteered all your chips on the turn, he probably would have raised you all-in with the str8 anyway. You were drawing dead and that's tuf with 3 aces but that's the nature of poker.
As for doing anything different, I don't think there was much you could have done different. Almost pot size bet on flop was a good attempt to cut the odds but at 15 outs that wasn't going to happen and the all-in on turn, well it was too little too late with this hand. You just had to get lucky and have the come on the river instead of the or any of the board cards pair up for your full house.