Sorry this has caused you so much confusion. From reading what you have shared it sounds like M isn't ready for any kind of commitment and he finally decided to distance from you. He may be feeling like your reaching out to him is uncomfortable and even bordering on feeling stalked by you. The reason I am saying this is because of how he talked about the police and also said you should get psychological help.

For whatever reason M simply was not ready to commit to you, and his actions also conveyed he did not even want to actually connect with you as a friend either. Listen to that and stop looking to keep track of him and instead just let go.