It doesn't sound like it should be anything bad. But, your man is a momma's boy. When his mom calls then she becomes Priority One and you temporarily get kicked to the curb. Maybe his mom was a single parent and her son feels like he owes her everything. Or maybe he just appreciates what his mom has done for him. Regardless of the reason, he's always putting his mom first and extending his undying loyalty to her.
What is it like being a "side chick" to his mother? Because that's what your relationship becomes whenever she's in the picture. This has to be frustrating as a woman when a man can't seem to "get off the teat." For the most part, a woman and man can still function as a couple despite him loving his mom a bit more than what his lady may prefer. However, will he ever get over mom and make his lady his #1?
Can a man grow out of being a momma's boy?