Am I bi?

Hey reddit! Long time lurker here. I 24F is in a current situationship with my co worker 31F. She expressed her interest in me and out of curiosity, I entertained her. I have never had this experience before but I do have a history of being attracted to girls but it's something that I have not pursued because I'm scared that I may not like it. We did went to second base and that's just it because I'm too scared to go third base. Idk what to do as well but I like it and want more.

Also, I have no idea if what I'm feeling is out of curiosity or infatuation. All I know is that I can't get her out of my mind and I do think about her all the time. I get lowkey get jealous whenever I see someone trying to flirt with her. I know I like her but I just need an advice to know if this is something I'd pursue because I don't want to hurt her. And since I mentioned that this is my first time, I am questioning my sexuality since my previous relationships are all male.