Am I fucking stupid? or am I ovethinking?

me and my best friend of 2 years have been hanging out more together recently since they broke up with their partner of 2 years, two times this has happened they have invited me to hangout alone, we've drank smoked weed ect, and then they have said that there is no other bed ready/ones that are available are good and so we have to sleep in the same bed. I have never had a single romantic thought about them in 2 years, but ever since the first time this happened (like two weeks ago?) they have been on my mind all the time. I can't stop thinking about it. Are they into me? other then the bed thing they have never made a single indication of romantic interest other then when we first met (before we were friends) they said they thought I was attractive but realized I was a loser (I was a bit weird in high school) and immediately stopped thinking about me that way. Am I overreacting to a situation? they are also seeing other people right now but not any official relationship or even dating just sort of hookups/sex. Has anyone been in a similar boat? What was the outcome? I don't know if I would want to date them but I would def be down to be FWB ect, but is it even worth ruining our friendship to potentially make a move?