Second Opinion

My boyfriend goes out often with his co-workers after work or sometimes come home, get dress, then goes back out. He posts videos with his co-workers on Snapchat; however, I don't hear from him until he returns home at 5 or 6 in the morning. At this moment, it's after 6 am and he is not home. He knows I have trust issues with him, so the amount of time he spends with co-workers, I have suspicions he's doing more. I told him about my concerns and he told me you have to live life and that he wasn't going to stop going out with his co-workers. Am I over-thinking the situation or is his behavior unacceptable? I'll give part 2 after I see responses from this post.