It's time to enter the next phase of your life without this man you love. Reveal his activity to the church leader (the main one), and let him deal with that side of it.
You will be lonely and probably miss him because you seem very insecure and dependent on this person. You want his love more than anything, so you will allow yourself to be degraded and abused hoping that if you "remain positive" and "good" he will change or feel sorry for you. And he knows this too and will continue to hurt you, because he enjoys doing it.
Have you been forgiving him over and over for your marriage and him, or are you doing it for yourself? I think at this point you are doing it for yourself, because you don't want to leave and still have a fantasy things will become great between the two of you and he will repent his evil.
A man that is a serial cheater and has the nerve to be a "church leader" is a disgusting, slimy, two-faced, every name in the book piece of garbage. Think about that because you need a perspective shift on who you love. He has no shame, guilt, or conscience. Whatever is inside of him that allows him to do this to you, has replaced whatever could love you.
The divorce and living alone will not be easy, but it's a life with a possible future.