<human>: Condense the text into a few key points

Ok , it may seem ridiculous to you but it's becoming a real problem to me.

Ok so i was with this girl for a year and a half and everything was perfect , she broke up with me 6 months ago and i haven't let go yet(I have to see her everyday at school and in the schoolbus and she hangout with the same people i do so it's kinda hard) and I started noticing that she is getting closer to one of my best friend. They always seem to hangout at her place(they live like 5 minutes away from each other) and i see it because she usually put snapchat story of him in her bedroom or whatever.

 I'm scared that they will start developing feeling for eachother. It will break my hearth even more if they started dating and i'd have to see them everyday and hangout with them everyday. I asked her about it and she said that she won't have anything with him. I know that i can't stop two people from being friends and being in a relationship but i'm scared of what's next. I'd have to lose one of my best friend that i know since im 9 years old and i'd really feel betrayed about it. It really stresses me out because i don't wanna face this situation.

Sorry if my english is not perfect , It's not my primary language.
<bot>: I'm scared that my ex might start dating one of my best friend because i notice that they are growing closer to each other.