Ex dating someone new?

Hello women of God, I need advice.. so I’m starting to have a feeling that my ex boyfriend which is still sort of fresh by the way is dating someone new. This was potentially confirmed last Sunday as he brought a girl that has been coming around more into our community to church. Which means he picked her up from her home and brought her to church. A part of me is just telling me that they aren’t dating they have just become good friends and another part of me is saying he’s into her and wants to potentially one day pursue a romantic relationship with her.. just about everyone in the church knows we used to date and still have lingering feelings there.

We ended things based off wrong timing and us still figuring out our lives and the future. As well as other things. At the end of the day if he does begin to date this girl I want to know how I should go about this as we all attend the same church and fellowships. I don’t want to stop going all because he’s dating someone new. I need help and advice on how to go about this God bless and I hope everyone has a great holiday.