Maybe tell him that you understand his need for freedom and you will grant it to him on some conditions:
1. He must tell you what time he’ll be home that night.
2. Tell you who he’s hanging out with for the day.
3. He should tell you 2 things he did that day.
3. He won’t engage in any dangerous/illegal activity.
Etc… These are just examples. You can set your own conditions.
Hashem should help you and your son overcome this challenge and give you strength to deal with it.