Friendship

I usually don’t get on here very often, really only to update my calendar lol but recently I’ve been having some issues with friends. So I thought we’re can I go and talk about it so now I’m here. Anyways, I had this friend who I meet last fall semester and we became good friends and this semester we have many of the same classes and had been on good terms but recently she just stopped sitting next to me and not even acknowledging me and she’s one of my lab partners as well and she has become super rude and making some remarks and I just don’t know why. I don’t want to start anything and considering that I’m very shy and don’t make friends super easily I don’t really know what to do. Maybe I need to try to make new friends but idk how I can do that.