Did i cheat on my boyfriend?

i was drunk at a party the other night, and was looking for my friend, when a random guy i never met before pinned me to a wall felt me up and when i tried to get away shoved his tongue down my throat. it lasted like 5 minutes. i feel so guilty about this because i have a boyfriend i love so much and just kept saying stop i have a boyfriend you're not him etc. etc and my friend pulled the guy off of me when she found me. i was disoriented and cried. i wanted to tell my boyfriend yesterday but he's upstate and i don't think he got my texts. how do you think he'll react to this? I feel horrible, did i cheat? thank you!