tell him that if to stop. if he doesn't tell him you will call the police & do it. keep yourself safe by not being alone with him. period.

a good friend does not treat another good friend like this. he is a jerk. when you allow him to treat you like this then you tell him it is ok...you need to be straight forward, clear & firm & say I DO NOT LIKE THIS BEHAVIOR YOU NEED TO STOP NOW.

maybe he should not be your friend? because really what does he bring to the equation other than grief?

don't work on projects alone with him in your house. do it in the library, mcdonalds, where ever but never alone. if he complains tell him to bad his behavior does not make you feel safe. if he refuses then walk & tell him to find another partner to wrok with.

this guy thinks you are a pushover...& honestly from what you have posted maybe you have been to some effect...if you don't want him to pester you you must take a firm stand. he isn't going to be happy but he is molesting you.
only you can get him to stop my making the call...once & for all...he is not going to stop on his own just because he feels like.

good luck
stumpy