Why is my boyfriend using a finsta to stalk his ex?

My boyfriend put his phone down but forgot to close it. We were cooking dinner so I grabbed his phone to move it off the counter but I saw that he was on insta looking at a girls page. I also saw he was using a finsta.

I took a picture of her insta because I thought he was cheating. He isn’t- just secretly watching her insta. He doesn’t even follow her, just watches her page.

This made me really insecure because, 1. it’s weird he’s stalking her. 2. She’s really pretty, mature, intelligent, educated. 3. We started dating one month after her. Now I feel like a rebound.

He seems to like me but most of our communication has been text or phone calls because he works a lot. We’ve been together for 3 months and have only had about 6 dates. Why is he stalking her? Could I be a rebound? Should I talk to him about this?

Why is my boyfriend using a finsta to stalk his ex?
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