<human>: Can you summarize the given text in a few sentences?

My bf of a year and a half never seems willing to let anyone know I exist. He told his parents and his brother after a year and 2 months being together and it was only because I let him know repeatedly that it was important to me. Today his parents asked him why he hadn't already told his grandparents who have asked him flat out if he was seeing anyone to which he denied. When he told me I asked him why and he vaguely referenced his grandparents religion, but with his (also very religious) parents asking him why today I just don't understand. 

Also, every time I meet one of his friends they say they've only known about me for a very short period of time. For example I met a friend of his a week ago who asked us first how long we had been together and was shocked when we responded "a year and a half." Then he turned to me still in shock and said "I only found out you existed 2 weeks ago." 

For a while before he told his parents I understood not wanting to tell them, but after it became a longish term committed relationship I don't understand his reluctance.

So two questions: 

1. Why would he avoid letting people know repeatedly, and should I not be concerned because...? 

2. How should I explain to him that this hurts my feelings? He is always good about communicating things that are important to him, but I need to work on my ability to do that. In addition I need to work on my ability to distinguish my youthful anxiety from things that are important.
<bot>: BF never tells anyone about me, it hurts my feelings, I'm not sure if I should just "get over it" because its youthful naivety and anxiety or if/how I should explain to him that it hurts my feelings.