Girlfriend sending weird messages to coworker?

Asked this the other night but only got a few answers (prolly cause it was around midnight when I posted)

So I found out the other from one of my managers at work that my girlfriend has been sending a lot of strange texts to another male coworker. The coworker told the manager all of the following while they were working together

She apparently has tried a couple times to get him to pick her up from bars while she was drunk, she’s asked him to bring her food or pick her up to get food, she once got drunk and told him that she was good at giving head because earlier that day he had made a joke about how she looked like she’d be bad at it, she was once at a club and blew up his phone trying to get him to pull up to which he refused. She then told him she was hungry and wanted a snack, he ignored this

Is this cheating? Supposedly the coworker wanted to tell me but didn’t know how bc I’m “a sweetheart”, coworker is a good dude it seems but I don't know what to make of this

Girlfriend sending weird messages to coworker?
Post Opinion