😐confused.

Before whenever my boyfriend was with me, he would never be on his phone. Now whenever he spends time with me he’s always on his phone texting his friends. When he would do it then I would tell why is he always on his phone like damn and he wouldn’t say anything. I don’t know why, it’s mad rude to me and makes me feel like something is off because he wouldn’t do that before. Even he would say it, that it’s rude for a guy to be on their phone while being with their girlfriend. Does anyone know why he could be doing this?