Friends with benefits?

Ok so, I have been dealing with this guy for a long time now, we have been complicated friends for awhile. We occasionally have sex on and off but recently he went down on me (something he never does) and only did that for a good 15 minutes. he's been being super attentive to me latley, not sure why but would like to add I recently lost 40 pounds lol! Could this be the reason? Am I thinking too much into this?