i need to know if im just delusional or if my best friend and i are into each other

my guy bsf is in love with me but im in love with his friend

i feel like shit after snooping through my bf's phone even tho he gave me permission without me asking. i found a groupchat of him, his ex, and her closest friend about having a threesome. all the contents in that groupchat messages are about them talking what positions they want to do, what toys to use, when and whose house theyre gonna do it at. i left his home and felt nauseous on my way back.