Boyfriend is texting with a female coworker when I'm not around. Should I be concerned?

All of us three work together.

We work in a bank... I'm a supervisor and she is a credit expert, he is a "regular" worker. He considers her to be his friend.

Me and him work desk to desk and whenever I have a work related trip and I'm not around, he and this other female coworker are texting. At first I taught it is a work related chat, because his job depends on hers, but then I realized he cannot be texting for hours with her for just work.

I doubt they meet, cause she lives 200 miles away...

Sometimes he barely talks to her especially when I'm with him all day, but when I'm not he stays online and her too for hours.

I'm feeling exhausted already, should I do something about it.

Boyfriend is texting with a female coworker when I'm not around. Should I be concerned?
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