Why is my boyfriend not telling family we are together?

Me & my boyfriend have been together 3 1/2 years & we own a house together, we recently separated for 2 weeks because he didn't want to be in a relationship anymore. Anyway I don't understand why he won't tell his family we are back together, we have been back together for 4 1/2 weeks & I am living back at the house. I don't understand why he won't tell them? he sees them most days so his had plenty of chances. He told me the other day that he had told them but I found out through a friend that he hasn't. I asked him a couple of weeks ago why & he said he didn't want them asking him about what's going on, but surely all he has to say is everything is back on. His told most his mates so why not his family?
Why is my boyfriend not telling family we are together?
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