You are definitely preaching the the choir, sister. I'm one of those die hard fans who invested, like hardcore. And that ending simply killed me. So much anger right now.
Worst of all, there's no coming back from this for me. I feel like they damaged Ian's character beyond repair, to the point where I hate him now and would never root for his happiness--much less with Mickey.
Even if the break up was tacked on last minute, they could've written it so much better, with respect to the characters and all their history. I could've accepted a tearful farewell, with Ian simply saying he needs time to figure himself out and love himself before he can love someone else...blah blah. But the way he flippantly disregarded Mickey's "I love you," and then walked casually back into the house laughing as Sammi (the woman who betrayed him to the army) starts gunning down his boyfriend who he has pushed to come out for 4 seasons so they could be together...I just don't get it. Why write it in this way?
It's such a slap in the face.