COnfused!! PERSONAL!!!!!!! Do not discuss outside of me

OK just go ahead and tell me I am stupid for this but. I have tenative plans to hang out with this really cute cub, ( in what manner we are hanging out I do not know nor do I know what his motives are) but this cub as I am told by some friends that are a couple are considering him to a third in their relationship. But I also get the vibe from the cub that he wants to date. and I am not entirely sure about his feelings on being their third. I am pretty sure they have talked to him about it but at the same time I am not sure they have either. Either way If he is going to be the third I need to set up boundaries, but I am nervous about asking cause I don't want to offend and all. I would like to keep these friends seeing s how they are the first ones I have had in Atlanta and the ones that like to include me into things. well have inlcuded me in the past, but we have grown apart. Maybe this weekend is a sign that that will change. I was so stupid for messing around with them this weekend then sleeping with that cub all snuggled up to him. The fact I actually slept is amazing to me only done that one other time and that was only after a hike that nearly gave me heat stroke and a few hours of sex afterwhich neither of moved from the positon we fell asleep in that night. Maybe just another case of being overly tired and nothing more. I do believe I will hang out with him but I will personally refrain from making advances.