Oh dear Chai, As much as you really may want this to work out only you can make the call if you want to finish and move on ,
I do have a friend in the same situation and they split up after JV came between them, I am afraid birds of a feather flock together and if that is the path he wants to take then he is walking away from you into the arms of the church and "mental" illness in my opinion,
I do not feel going to church in whatever guise makes you either a good person or a bad person but things need to be kept in moderation a we all have to live in the real world,
Just make sure you walk away with what is rightly yours, if you can do it amicably and fairly then please do so , if you choose to stay I hope that you find happiness and love re ignites itself , only you can make that choice , best of luck , Live life to the full .....