Need advice/ boyfriends best friend

My boyfriend of 2 years is a senior and i’m a junior. I may sound stupid and paranoid but one of his best friends have been acting really weird and making jokes about wanting to have sex with me. he calls me beautiful and tells me i have a nice ass and look hot in my cheer uniform but i just ignore him because i feel uncomfortable. my boyfriend (liam) is super protective and when i go to his football practise (he is a quarterback) his friends act normal. it’s when he isn’t around that he’ll say things that make me feel weird because he knows liam would get super pissed. his other guy friends laugh when he says things and i really don’t like it but i don’t want to ruin liam’s relationship with anyone because he’s known them for years and i know that he would get mad at them and maybe even me. i’m a very confident, loud, honest person so when i act quiet around his friends he kind of knows somethings up but he thinks i would tell him if something happened. i don’t know what to do because i don’t want to ruin their friendship but i want it to stop. i’ve told the guy multiple times that it makes me uncomfortable but he calls me a princess and says that once we have sex i’ll want him to do it again. do i tell liam or just ignore it? my friends think i should tell him but i don’t want to make him mad or sad.. he treats me like an absolute angel and princess and i’m so lucky to have him, and i know he will believe me because he always puts me first but i’m scared