How do I become emotionally detached?

My fiance has recently lost any sort of emotion. I believe part of it is due to the new position at work where he is forced to be like that. Problem is, he brings it home. Because of this change, anytime something bothers me, he doesn't seem to care, but says he does. This has been hurting my feelings and eventually leads me to crying. Here is where i become frustrating. When we first met, he was always hurt by me because I didn't show very much emotion. He begged me to show these feelings and I did. Now because of how he is, I am an emotional wreck. I dont want to be like this. I think because of his recent change, he is seeing me as weak, when in reality, I am crying because of his actions. I want to be my old self. I want to show indifference. I like my old self and changed because of him. Tell me what i can think, chant to myself, do....anything that can help me not be so emotionally messy.