My boyfriend gets mad when I tell him I miss him? Why's that?

I'm entirely confused. I never mean to offend him, but for some odd reason he gets really offended or mad or something when I tell him that I miss him. It makes me feel really rejected. It's not that I need to be around him or see him all the time, I just like him a lot. I am just trying to flatter him... I even told him that and he gave me this whole "I can't change" speech. Change what though? I have no idea what he's talking about. I think he's looking into it way too much.
My boyfriend gets mad when I tell him I miss him? Why's that?
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