There was one time when Rumple freaked out, yelled at Belle, shook her and threw her into the dungeon. It was despicable behaviour. But as Midnight Dreary and Josephine rightly said he is the Beast.
In Beauty and the Beast there is a scene where the beast risks his life to save Belle from the wolves, and injures himself badly in the process. I wish Skin Deep showed a scene like this to illustrate how their love is not just one sided. Belle brings light, humanity back into his life. Rumpel does truly love Belle in return, he even vows to protect her in the finale. Hopefully season 2 we will continue to see Rumpel redeem himself, Belle deserves that. He regrets treating her badly, and if you think about it, Belle did not have it that bad. She was able to walk freely within the castle, was not hurt, or starved, Rumpel even let her go. I’m not saying that excuses him, but I mean he is supposed to be a beast. It’s Belle’s fate to be his conscious, and basically turn him human.