The protagonist, a guy in his thirties, arrives in a town where something strange is happening. There are cases of missing people and people behaving strangely I believe. He notices something and starts to investigate. He meets this good looking lady who he usually talks to. Later on she falls in love with him but it’s revealed she was actually an alien. After finding that out the guy just runs for his life.
I watched this in the late 90’s on TV. That’s all I can remember.