Why does my guy friend only call when his girlfriend isn't around?

7barbieringz
We don't text much but he does call me a few times a week, just to talk about life stuff. But I noticed like, if his girlfriend is at his place he will only call if he left to run errands or something, and when he gets back he hangs up. We have hung out alone and nothing happened and we planned to hangout again after the holidays. His girlfriend has never been there when we do hangout, even in groups. Multiple times they planned to come as a couple but suddenly bailed last minute and he came alone. I also never met his girlfriend and they've been dating almost a year.
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Update copied from comments:I also forgot to say the other day he flaked on me coming over because apparently his girlfriend randomly showed up and he wasn't expecting her. He apologized for standing me up but this is what he said, "sorry about the other day my girlfriend showed up and we were kinda arguing, and I didn't want her to walk in and see u and think I was trying to blow your back out (he laughs). I'm not tho lol!"
Why does my guy friend only call when his girlfriend isn't around?
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