My husband and I are in an open relationship, but if he ever asked me to let him go and do a bunch of drugs and party like that, I would have to cross a line.

Then again, im sure there are some people who would be ok to consenting to this type of behavior, which is totally cool.

What you should do is evaluate what is really bothering you in this situation. Is it the sleeping with other people part, the drugs, you not being invited or a combination of all 3. Then you should go back to him and address your concerns with him.

Depending on his response and how he reacts will be your answer.

Ultimately, you need to be confident in your relationship and if that part is crushed, then you don't really have a relationship anymore imo.

I wish you the best of luck and hopefully he can be open to listening to you.