idk what to do

so i’m in a very weird situation. i recently realized that i’m bisexual. i’ve kinda known for like my whole life but ignored it until i met my best friend about a year ago. she’s very openly bisexual and i guess that just made me more comfortable with myself and my sexuality. anyways, her and i have gotten super close and she confessed to me that she has a crush on me and has for a while. but the thing is she’s in a serious long term relationship with a guy and i am as well. we always joke about how if we weren’t with our boyfriends we’d be together and we always joke about dating. friends around us keep telling me that we should try being together because we would be happier together than we are with our boyfriends which idk if that’s true. i love my boyfriend and i’ve been with him for 3 years now and i’ve always seen myself marrying him, but now i don’t know because i feel like i’m falling for my best friend and i think she’s falling for me too but it’s such a weird situation because we’re both in such serious relationships! i also feel like i need to explore my sexuality but having a serious boyfriend really complicates that because i am obviously not going to cheat on him but i feel as though he’s holding me back in that aspect because i don’t know what it’s like to be with a girl and i may never know. idk, i’m very confused and stuck at the moment and would appreciate other peoples thoughts!