Why do men respond more with their friends through texts than with their women?

So my boyfriend and I were getting into a argument. When I asked him why he responds to his friends through texts, during his work hours. Instead of me coming first.

He Then explained to me that with his friends, it’s just simple texting that he doesn’t worry about. During his work time. While with me, he wants to give me all of his attention whenever he is not busy.
Why do men respond more with their friends through texts than with their women?
This bothers a lot of women with their partners about feeling coming in second in their lives. Women want to come in first for their partner. Especially being responded back right away through texting or calling.

But if this is common among men to respond to their friends before their partners. Can the men please explain why?
Why do men respond more with their friends through texts than with their women?
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