How to deal with boyfriends possessive mother?

Hey guys, just looking for a bit of advice over my boyfriends possessive mom! Okay so we have been dating a year and I have not yet met his parents. He is 26 years old, and goes home to visit his family every break from work he gets, weekends, everything and I get very little quality time with him (we currently live 68 miles apart). Now THIS bothers me. I had not seen him in 3 weeks due to work commitments and the other day when I was visiting him for 3 days, he handed me his phone and told me to text his friend saying we would be at his house in 5 mins. However his phone was opened on text messages to his mom. She was asking him to come home to the family house that night and demanding to know why he wasn't coming home. This irritated me, no one in his family is sick, he isn't a carer for anyone, then I would understand her demanding and possessive nature. He does nothing when he goes home apart from sit about watching tv and reading or doing work related stuff. His mom knows I exist but yet she has never asked to see me or even asked me to visit. She doesn't know that I stay over at his house and he is too scared to ev en tell her. They believe in God but they are not overly religious. What the hell am I dealing with here? we are both adults, I am 21 and yet I have more freedom than he seems to have. I understand if he wants to be close to his family, being a family person is a good thing, but he acts like a child having to go home to his mommy every weekend and refusing to spend Saturday nights with me or any quality time. He is off work for a week soon and she is demanding that he spends that time at home. It is almost like the fact that he has a girlfriend doesn't even come in to the equation. Why must she baby her son and be so possessive! he is almost 20 for God's sake!. Just looking to see if anyone has ever been in a similar situation? any empathy at all helps, to be honest this is really irritating me to the extent where I am losing my patience with the relationship. Thanks guys

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