a couple of weeks ago i told her we should be honest with ourself and admit we need to take some time off to heal.

This week a mutual friend setting up a surprised birthday party for my sister. it's an important birthday so she's gonna be there coz she knows my sister. since it's a surprised birthday party they ask me to take my sister to the place which mean i have to be there.

what should i do? i don't want to be a jerk and ruin my sister's bday but i'm just starting to move on and i'm not ready to see her just yet. should i just swallow my pride and sit through it?