How to ignore the fear of abandonment.

I have a new friend who has talked to me every day for a month and a half and we FaceTime/call a lot and he's given me no reasons to believe that he'll ever just up and disappear.

However, I'm still scared that he will because of how my friends did this years ago. I know I'm just overthinking and I don't really tell him this because our friendship is great! I just need time to get over these thoughts and needed somewhere to vent.