What if we HAVE to see them in person quite often during NC?

Just as the title says. I started NC yesterday, me and my ex gf used to talk/text everyday for nearly 3 months straight. There was never a day where we didnt talk or text. We broke up 5 days ago. Yesterday was the first day in months with absolutely NC. But see we go to the same church, and I was wandering what I should do because Im going to have to confront her often and I can handle NC with messaging but Id feel like Im being rude in person especially because I agreed to just be friends. She knows I want her back though. Im thinking to present myself as if Im fine with everything but not too sunshiny if you know what Im saying. Id say hi and try to respond to necessary stuff without being rude but idk atm. What should I do?

You must make her think you are doing ok without her. Seeing her in person probably upsets you but try to look happy and to not pay attention to her. If she talks to you or says something to you, act cordial like she is an acquaintance. There is no need to ignore her, just don’t go out of your way to speak with her.

Ok thanks, I will do that. Also, after only one day of NC she texted me on day 2 just asking how Ive been, I felt like saying something but I stuck to this and havent replied. A few hours later she messaged me saying if I could please reply to her text and that she doesnt want to lose me as a friend too? I still didnt reply, this morning she says she was only trying to be nice and to not be surprised if she doesnt talk to me in person. Today is day 3 of NC. Do I reply to her? or stick to NC cause as much as Id like her back I feel like Id lose all hope if she doesnt even want to be at least friends.