You need to tell your boyfriend what you did ....right now. I appreciate that this was a knee jerk reaction to what you perceive could be an indiscretion on his part, and hopefully he will understand.

It's a slippery slope when we catch ourselves checking up on our significant others, and we need to remember that we have little control what choices our adult partners make...only hope and trust that our relationship is in a healthy enough place where infidelity won't be a cause for concern.

In my opinion neither this other girl or your boyfriend has done anything wrong really, they are simply both adults chatting to each other at this stage. I suggest that you talk to your boyfriend about boundaries that you both feel comfortable with in moving forward. It's when this type of stuff isn't discussed openly that things start to become murky and confusing.

Be kind to yourself jcc, and welcome to P.C