Just some advice and guidance needed

Hey everyone just looking for an opinion here 🙏

Been dating this girl for 2 months, who recently got out of a marriage of 4 years (Separated not divorced yet).
Things were absolutely phenomenal, communication was great, dates were great, we talked about meeting one another families and what the future held. A week ago she heads to New Orleans for a wedding and her ex steals her phone and goes through her messages about me and pictures.

Long story short he vents to her on how he wants to work things out and fight for her. I get a phone call the next day and text messages saying how confused she was because she started having feelings for this man again.

Ever since this has happened her communication has completely changed in context and what we had a week ago changed within one night.

I am supposed to go to a wedding with her this Saturday and I go back and forth about even wanting to go because I should know my own worth and someone who wants to be with me will be with me 💯. But then another part of me is like go to the wedding and maybe she will pick you!

I have been driving myself crazy the past week on how quickly everything changed so maybe some of you great people out there can give me some guidance.

Thank you!

Justin