He finally told Robin he was in love with her and she remains painfully (and yet delightfully) oblivious.
That tiny headshake Neil Patrick Harris gave after saying "I love you" was probably the most heartbreaking thing I have ever seen on this show. Even sadder than that "look of love" he was giving off at MacLaren's at the end. Given Barney's history, it was probably the bitterest rejection (for lack of a better term) he'd ever had. Neil Patrick Harris should get an award for that headshake.
I love that this show has the best comedy writers who are so great at mirroring reality. That things don't always have to end in angst and drama all the time. That friends do fall in love with each other – that it doesn’t have to be love at first sight. And that yes, there are people in this world who really are nice. I'm happy that Ted Mosby is one of them. I'm glad he stepped aside for his best friend.
Here's hoping the chase ends up well for all of them.