A lot depends on what you mean by "canon." Do television appearances count? If so, Kermit's been pretty mean about Piggy lately. But he was pretty ushy-gushy last year at the TV Land awards.
What about books? Do they count? If so--once again--Kermit was pretty awful about Piggy, but then he turned around and said some incredibly sweet things.
What about billboards? THere was that billboard that said, "Eats flies. Dates a pig." Was that true? Or does the word "dating" mean something totally different when you put it on a billboard?
Which movies count as canon? If we can accept all "back-stage activity" as canon, then was Kermit really snarky with Piggy over complimenting her first number and avoiding her kiss? If so, we have to accept that his later very enthusiastic kiss was true too.
In short (well, in conclusion), there's just a lot of conflicting information out there--all coming from the same sources! Are they on again? Off again? Both? And that was a lot of what we saw in TMS--on again, off again, fighting again, lovey-dovey again. I could live with that, if it doesn't get so darn mean I can't watch.
We loved 'em when they fought, and we loved 'em when they made up. In short, we'd like to see more of them doing both.