my boyfriend has a new friend (pretty girl), advice?

Monique

So my boyfriend has a new coworker. She's pretty, and they text a lot. And I feel like they are both a good amount of invested in each other's lives.. considering they text SO much.. he's not much of a texted but I guess he's "getting to know her"? Bottom line is, I freak out pretty easy because as soon as I see that.. I call it a RED FLAG.. but I'm also over emotional 😒... it's something that is hard for me to trust with him because he's always like being friends with pretty girls... always. I hate that. They talk about her hard times and such.. Should I keep my guard up or am I over reacting? 

UPDATE: I was right