Why does my boyfriend go out to dinner with his friends all the time but will go only once in a while with me?

So, my boyfriend will take me out to eat sometimes which is nice but rarely happens, I mean we make dinner together more often then not, but he will always go out to dinner with his friends and when I say things like hey why don't we go there to sometime it's such a great place, he'll tell me it's kind of really expensive. I just don't understand, I mean he's 27 and I'm 39 so I don't know if it has something to do with that. He's never told me he was embarrassed to be seen with me, and we do go to the movies and to Walmart and such. I just done understand the dinner thing.

Why does my boyfriend go out to dinner with his friends all the time but will go only once in a while with me?
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