11:30pm phone calls

This is driving me a little crazy. So my boyfriend works in the entertainment music business so he has night shifts. Well this girl he knows from work tends to call him at night around 11:30pm. Is that too late? Am I making a big deal out of nothing ? I just have a bad intuition with her. She has no man and supposedly no friends, you think she is trying to get at my man?

She doesn't call him a lot but does she know calling that late is kind of disrespectful?

I can't do anything huh?