I love him, but I can’t stand him.

I really love my fiancé, but he’s so immature and it’s starting to become a turn off. A lot of it is his personality, like stomping and singing at the top of his lungs (all the time), apparently he’s always been that way. But the learned behaviors, like getting upset when he doesn’t get his way or doesn’t get attention, makes me look at him like a child. I feel like everything he does, he reminds me of a 10 year old. And it’s like the more off putting he becomes, the more my eyes wander. I’m extremely attracted to this younger guy at work and now he’s all I think about. My fiancé used to be the best thing that ever happened to me, now I can’t listen to him talk without getting annoyed. And all he ever really talks about is sex, so he becomes even more off putting. I just don’t know what to do. I love him, I do, but I don’t think I’m in love with him anymore...and I think he knows. 😞