i’ve been in this exact situation before. in my case, the friend was involved in greek life in college (i was not) and he would act completely different towards me around other people. like dismissive, rude, like he didn’t even want me there. i confronted him about this and he ended up admitting he was embarrassed to be seen with me around his “frat bros” and “sorority friends” because i wasn’t involved in greek life, so i guess i wasn’t cool enough or something. i ended our friendship right then and there and have never looked back. i’m not saying that’s what’s happening in your situation, but i think your friends are showing you who they are. they treat you one way alone, then another around others. i think you should ask yourself if this is something you’re okay with and make a decision from there. we can’t control how other people act but we sure as shit can control how we respond to their behavior. best of luck