My ex won’t leave me alone, i caught him setting a date with a girl to go sleep with her on social media a complete stranger.

Ive told him i do not want anything to do with him to leave me alone. He keeps telling me he won’t give up & blows up my phone. I have blocked him but he called me from another phone & tries to knock on my window. He says we belong together & were supposed to grow old, that he made a mistake but hed do anything change anything about himself to be better for me and fix this (which i call bullshit) he is making it so hard for me I’ve been crying non stop because he knows what to say to me, its so hard. But i have no tolerance for cheaters. He scalled me more than 200+times. I have blocked him from everywhere. We made such beautiful memories (for me) but completely ruined it.