<human>: We have been close friends before we started dating, and she mentioned this guy then. He was her college boyfriend and first real heartbreak. Since then he has moved out of state and I knew they still kept contact, but it didn't matter to me because obviously we weren't dating.

Fast forward to today, we've been living together for a couple of months, and have been dating for about two years. Things have been going very well. Up until she got a text from this guy while we were watching tv, saying something like "I really miss you too and I can't wait to talk" 

I recognized his first name, but did not know his second. Anyway, I asked who it was and she gave me a long story about how it was her cousin who just got married etc. so it wasn't a big deal.

Well, she is out of town this weekend and I was using her kindle earlier, and I came across her FB. I did it. Snooped. And as it turns out, her "cousin" is actually her ex. 

The conversation was from a couple months ago. It was fairly innocent. Lots of I miss you and lots of I still want you in my life kind of stuff. She even mentioned that she was with me. Again, this conversation was from a couple of months ago.

My question is, should I be worried about this? Is this behavior acceptable in a healthy relationship? The thing that I've been thinking about is maybe those messages from a couple of months ago have escalated into something that she has to lie to me about. Thoughts?

Give me a shortened version of the text
<bot>: I admit it, I snooped my gfs FB account and found out that she misses her ex and it's to the point where she is lying to me about it. What do?