my sister got engaged 2 months ago and i’ve already had a weird gut feeling about her fiancé. This weekend my husband and i had a little party and invited my sister and her fiancé. I was in the kitchen getting something out of the fridge when her fiancé came up behind me and grabbed my ass. i turned around and asked what he was doing and he said that i’m very beautiful. he leaned towards me and tried kissing me. i dodged the kiss and pushed him away from me and quickly left the kitchen. i know i should tell my sister but i don’t want to hurt her. what should i do or say?