Falling asleep with boyfriend's best friend?

I'm dating someone but not officially in a relationship. I'm friends with his best friend through him - and the best friend all along has considered me an amazing girl and been attracted to me. Lately, things haven't been going so well with the guy I've been dating. The friend told me that he's been kind of jealous of the guy (my "boyfriend,") but won't fight for it. We then fell asleep in the same bed with his arm around me, nothing ual happened but it wasn't platonic. I was just lonely as the bf has been traveling for weeks and out of touch. What should I make of this?