Hi sirnut,
I can understand how uncomfortable that would feel if you're recovering from the break-up and you see her places where you both frequented together. I would feel really anxious if I were in your shoes.
I really don’t feel strong enough to see her regularly at church if there can’t be some reopening of mutual respect and courtesy between us
I'm non practising but I remember that there would be different sermons, Saturday evenings and then two on Sunday that could of changed. Which one do you think that she would most likely show up at? Can you go to church at a different time?