Some more bits of information, please: You say that the poly lifestyle is one that interests you - did it interest you before this other person came on the scene (in other words is it interesting to you anyway, or it is specific to this other person)?
Secondly, if you have this interest in a multi-love relationship, have you shared these thoughts with your current boyfriend at all?
I think your approach may well change, depending on the answers to these questions.
"Listen, or your tongue will make you deaf." - Native American Proverb