Conversations are forced due to his clamminess. Is he scripted around you? Do you often have to find conversation themes or interrogate him to get him to talk?
You feel like you have to walk on tiptoe around him to prevent making him leave.
He's been starting fights with you, criticizing you for everything, and generally being a jerk.
It is a futile endeavor to expect him to show compassion toward you despite your best efforts.
The process of persuading him to actually go out with you feels like yanking teeth.
He has begun to lash out in anger or regularly complains about a specific element of your relationship.