My long time friend is doing things I can't morally agree with. Should I end our friendship?

It sounds like this friend of yours is going through some kind of weird mid-life crisis. I normally wouldn't have time for these people except that this individual is a long-time friend of yours so here's the deal. There is nothing you can do because the damage has all ready been done. I think you should re-evaluate your friendship since he obviously didn't care what your opinion of this kind of behavior was. I'm sure you have other friends that you can count on when you need them and look toward meeting new friends. Whatever you decide to do. Good luck.