Girlfriend and her co-worker...Suspicion

Anonymous
So let me preface this by saying I met my girlfriend two years ago at work while she had a boyfriend. She cheated on him with me and a few months later broke up with him after 7 years to be with me.

I know my girlfriend loves me with all her heart. But...I will always be looking for any signs because I know that her last boyfriend never suspected anything.

We don't work together anymore nor does she work at same place. Now there is this coworker who she tells me she gets along with.

There haven't been that many signs that suggest something is going ton but I just want to know if I am being paranoid.

1. He broke up with his girlfriend and he texted her about it. Out of nowhere. (Who does that?!)

2. He texted her this morning, "Wake up" (Who does that?!)

3. She likes Hello Kitty and every time he sees something related to Hello Kitty, he sends her a picture of the item. (!)

Anyway,...is this just me?

I don't think I will ever be able to be comfortable with any of her coworkers, ever, because of how I met her.
Updates
+1 y
I tell her he wants to F*** HER but she says he is just a coworker. I doubt she actually believes that.
Updates
+1 y
Here's the BIG problem. They work in a small room, given the nature of their work, so they are alone. Obviously not all the time because there are other workers but there are times when it is just them two.
Girlfriend and her co-worker...Suspicion
4 Opinion