Separation anxiety

Me and my boyfriend only see each other within the weekend and on Friday’s. But there are times where I’ll find a way to see him during the week at his house. Every time he leaves me on Fridays since I only see him for a couple of hours when he says he’s going to leave I always get super emotional and sad and even cry after he’s gone.

Idk what to do, I know I’m overreacting but i just get so sad knowing I get so little time with him throughout the week (and u can forget about privacy)

Does anyone have any advice on how to cope with separation anxiety