How do I know when my boyfriend is getting tired of me?

so he's been really busy with his work, so it's hard to tell. but he's been saying my personality is very different from his and how sometimes he doesn't like it, but he accepts and is used to it. maybe he just saying it this way to be nice or it's like a warning? what if he's slowly starting to resent me over this? is there any way I can tell? (fyi sometimes I feel like he misunderstands me)
How do I know when my boyfriend is getting tired of me?
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