Hah! I mean of course “… until you pay him $100.”
Indeed. And being superior and contemptuous about paying the money makes about as much sense as if I were snotty and contemptuous when I paid my mortgage, because the bank was being all butthurt and bitter about expecting me to pay.
Nope: I entered into a contract with them, of course they expect me to fulfill my end.
I saw Roger Waters: The Wall in the O2 aka Millennium Dome aka North Greenwich Arena (as it was called over the olympics) last year and it didn’t cost anything like the enormous amounts you’re talking about. For sure I was in the cheapo seats but I don’t think it was any more than about £60!
It was great though. And no I wasn’t there at the one David Gilmour was in. In fact it’s mildly amusing - the performance I was at a lot reacted to the bit where he had come in a couple of nights before in mad applause (as that had been online and quite possibly just on TV) before very quickly getting disappointed!
I told my wife about this situation, and her first comment was that his gift to her was “not appropriate.” I would agree. If you’re going to give someone a gift, give it to them, don’t make it a promise for 7 months down the line (more than twice the duration of the relationship so far!). In a way, this “gift” may have been his way of trying to pseudo-blackmail her into maintaining the relationship for a longer time, or perhaps he had his doubts that it would last so it was his way of being a cheapskate and not actually having to give a gift.
All that said, you owe him the $100. You agreed to pay a price for the tickets, so pay him.
Again, she already paid him. This conversation has moved on past that. 
How? Did he mislead you as to the nature of what you were buying? Were there hidden costs? Did he give you tickets to the wrong performance? Did he force you to buy the tickets off him?
You knew you were getting and you agreed to the price. If it wasn’t worth the price, it’s your fault for agreeing. He didn’t rip you off.
Yes, this. I do think it was tacky of him to present something as a gift, but really hold it “hostage” based on a future condition. And I agree about the pseudo-blackmail thing and the cheapskate thing, in hindsight that totally makes sense.
My ex-boyfriend promised to love me forever. Would you believe he’s married and has two kids now, and doesn’t love me even a little bit? The nerve of that guy. I think he married her just to spite me.
It was an attempt at blackmail, obviously.
…or he had no reason to believe that Green Cymbaline would break up with him because she just wasn’t feeling him.
Seriously, GC, let it go.
All you’re doing in this thread is adding a “yeah!” to whatever responses you think affirm your own position and dismissing those that do not.
You aren’t looking for advice, you’re looking for affirmation. And there’s not a lot to be had here, because it’s not that you’re “wrong,” per se, it’s that you’re being catty and vindictive and trying to apply “legal/moral” constructs to a situation to which they do not apply.
Plus, only hot chicks get away with such blatant double standards.
This, precisely. You very clearly have never had an open mind about this situation. You haven’t even remotely acknowledged the possibility that your ex’s motivation in this scenario could actually be rational. You are coming at this from the standpoint of “I’m a completely nice and selfless person, and he’s just bitter and whiny,” and if anything anyone says does not fit that view, you basically ignore them. And then you can’t understand why some in this thread question your maturity. It looks like you were and continue to use this thread to demonstrate to yourself that you’re a better person than your ex, and that you’re only absorbing posts that support that.
heh
Despite the fact that you agree with me on these somewhat inconsequential points, you handled the situation about as poorly as possible, so congratulations.
Morally: You exchanged gifts. You bought him one game ticket and kept one for yourself to go with him. Therefore he owes you one concert ticket and the other is his. You have both tickets now so you need to pay him $200 for his ticket.
Legally: Promised gifts are not enforcable, but maybe you could clarify something for me. Was it a coincidence that you both got tickets for the other or was there some sort of discussion about it beforehand. If you two talked about exchanging tickets, then I would argue (IANAL) that it was an oral contract and may be enforcable since you took him to the hockey game. Can we get an actual lawyer to rule on that?
My personal integrity is worth more than $100, YMMV.
ETA: @ the OP.
Did he promise you any kids during your relationship? If so I think you might have a case.