Robin: No! What did you do?
Ted: I seriously considered just marrying her out of sheer awkwardness. But I did what I had to do. I did what anyone keeping someone on the hook should do. I broke her heart.
[flashback to Ted in Henrietta's apartment after the accidental proposal:]
Ted: Henrietta, I'm sorry if this is blunt, but I think I owe you this. I don't want to be with you.
Henrietta: Right now?
Ted: Ever.
Henrietta: But we're still getting married, right?