Scared of My FP Leaving Me for Better Friends

My fp is out at the moment with their friends from the musical there doing drinking and for some reason i’m scared, i’m scared of them leaving me finding better friends in some ways i’m jealous but i’m also scared that later on tonight they message me about the fun time they had and that they kissed loads of people and i get jealous of them kissing people all the time they hardly do it unless they’re drunk i don’t know what to do obviously i can’t do anything but i’m nervous for what they will say to me after i’m trying not to think about it but i’ve just come home from work and now it’s all i’m thinking about