We've been together 3 years. I haven't been happy the past eight months, but wanted to give it a chance. I've started to have the talks about moving out, but she's crushed. And it just hurts me to see her that way, but I know if I continue the relationship, I won't be happy. She has talked about marriage and I just don't think I can ever marry. So I feel like if I kept going in the relationship, it would just make it worse later on. But how do I not feel so awful since she's more into it than me?