I want a cat, boyfriend does not, can he really stop me?

When I moved in with my boyfriend 2 years ago he told me that he doesn't like cats, which I already knew, and that we won't be getting one, which I said was fine as long as he doesn't get a dog, which he agreed with.

Now, I really, really want a cat, have been for some months and this longing won't go away and I know it never will, and I've tried to talk to him, explain my feelings to him but he's adamant.

A friend of mine recently had a cat give birth and one of the kittens is so beautiful, my friend said I can have her for free but my boyfriend is adamant and said that I agreed to this but I feel that if he cared enough about me he'd relent on this one little thing, but he won't

If I just get it while he's out, can he really stop me? Should I do this?

I want a cat, boyfriend does not, can he really stop me?
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