It won't get any better, and it isn't your fault. It isn't because you aren't a good enough partner, or you don't meet his needs, or you're not fill in the blank enough. Do not let him place one ounce of blame on you, which he will most likely try to do.

If you can be okay, for the rest of your life, knowing that your partner does these things, then you are in the right relationship for you. If you know that you do not want a partner who does these things and crosses boundary lines and behaves in a sexual way behind your back, then it is time to pry yourself loose. If you do not want this kind of activity going on in your home, then please know - it will not get better, and it was going on long before you came into the picture.

You cannot change him, you cannot save him. You are only responsible for yourself. He is responsible for himself and for honoring what his partner needs. If he cannot do that, then start taking care of yourself, and protecting your heart. Addiction damages everyone.