I'm actually so mad at my friends right now

So for the past few months I've liked this guy, and my friends have been insisting that he's absolutely Bi. To the point one of them told me that he told her he was indeed bi.

So anyway my dumbass chose to actually trust them all despite not thinking it. There were isolated times I had also thought it (he drew on my hand with a highlighter and said it was good luck for an exam, he came up to me and punched my arm while we were signing in to a free period) but on the whole I thought he was straight.

Anywho, I told him that I liked him and low and behold he's straight to the point he has a girlfriend. Long story short now I know to not trust my friends and only listen to myself when it comes to relationships. Guess I'm finishing year 13 single after all.