I broke up with my ex because I felt him distancing from and also he wouldn't make much time from me. I heard him on the phone about to cry, so I just hung up. A few minutes pass by and he writes "Lmao". The next day I called him accidentally, and he texts me who is this, and pretends to be a girlfriend and tells me to stop texting him or there will be a problem lol. I know he is lying, but why? and what should I do?