What does it mean when a guy expresses that he’s not going to give you more but can’t tell you why?

sd1223
I’ve asked the question more than once to him and I just get silence. He’s just like he doesn’t desire marriage, kids, etc. with me. He was my boyfriend 2 years ago but he can’t give me a reason why he can’t see us being more.
What does it mean when a guy expresses that he’s not going to give you more but can’t tell you why?
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