I recall a movie I saw on TV around 1970’s. It was about a single mom who lived with her son and he was very jealous when his mother dated. He was about 13 and got into trouble with older teenagers. He tried to kiss an older guys girlfriend and the boyfriend chases him. A biker saved him from the guy and they became friends. He put together a plot with his biker friend to get his mom’s boyfriend in the apartment but to kill him by starting a fire.  I think when the biker found out what this kid was planning, he called the police because he didn’t wanna be part of a murder or he wanted to prevent it.  The movie ended where unfortunately it was his mother that was stuck in the apartment and she ended up getting killed by the fire. The boy was put into some sort of rehabilitation place and the mother’s boyfriend went to go visit him. Does anybody remember the movie?