Im not sure this is a sign but today i went to a religious class and my ex's friend was there again. I saw him two weeks ago as well. The first time he saw across from me in the opposite side of the room and kept starting at me.Tonight he literally walked over to where i was sitting, and i wasn't even paying attention bc i was looking at my phone for work reasons, and he asked me if someone was sitting next to me and picked up the chair and left. I know he likes me because of a dating app i recently installed on my phone and he liked my profile.What do i do? He is my ex's friend. The last tim ei kept bumping into him he told my ex about me and lied to him that i could only be friends with this guy if he deleted my ex as his friend...so he started up trouble bc i was avoiding him. Could this bring my ex toward me through jealousy or just open up another can of warms that may be bad but interesting all together? Any advice...not sure how to proceed because i practically ran from him when i left the lecture and i knew he was smoking and waiting for me outside.