I mean, listen, I've been following this program nearly as long as you have, and I'm all too familiar with the historical potholes, if not personally involved as far back as C-H-C and the RPI game (ironically, one of UNH's most celebrated games to this day was a loss in the end). It gets to you, no doubt, and it can color your whole experience. But I'm sorry, Greg … you have a 3-0 lead that late in any game, at any arena, especially in modern day hockey, and you have to expect that team to win the game. You never hear anyone saying "Oh, watch out - the three goal lead is the most dangerous in hockey!"
Remember when the B's came back from 3 goals down in the playoffs (I think it was a Game 7 even) against Toronto? THAT was a BIG deal. And why was it a big deal? 'Cuz they overcame a 3 goal lead!!! For every memorable game where a team climbs out of a 3 goal hole late in a game to win it, there are probably over a dozen non-memorable games where the leading team routinely runs out the rest of the game and holds on to win. It's not a huge ask. UNH should have been able to do that.
The idea that you "knew it was only a matter of time" after UMass scored late in the 2nd period probably says more about you being conditioned to expect bad things to happen to UNH in the postseason, than it does about the reality that a #8 seed still had a two goal lead with 20 minutes left to play. If someone tells you before a game starts that your team is going to be two goals up at the start of the 3rd period, 99.9% of the time, a regular fan of Team X is gonna think "hey, that's pretty good, and we'll take our chances with it". Regardless of whether the game is in Durham, in Amherst or on the moon.