Over the seasons, Lily has interfered with a lot of things, mostly Ted's relationships. Some examples of this would be when Ted found out that most of his relationships where ended because of Lily or that Lily bet Marshall that Ted would not end up with Robin. Lily is always pulling this crap and Ted gets mad for one episode and then forgets it ever happened! Lily just ruined Ted's future and he doesn't care. If I was Ted, I would defriend Lily so that maybe my relationships would work out and I'd find "The One" a lot faster. Lily has some bad habits when it comes to interfering in people's lives, but at least Ted can forgive her.