trusting my partner /wlw

weve been together for almost two years now. i want to trust her. i want to fully let my guard down. ive never been cheated on and i know shed never cheat on me. its just really hard bc we used to just be best friends and she would always point out the girls she thought were attractive. so i kinda got a sense of what her type was and thankfully i fit into the category. but now that weve been together i just cant help but worry about who she thinks is attractive now and if she wants to sleep with other girls. i know im insane and insecure but i just dont know what to do. i know shes with me and she wouldnt be if she didnt love me and find me attractive. its just hard getting over that idea of her finding somebody else hot.