Boyfriend seems a bit "off"

Hey I have been with my boyfriend for not that long at all really a month and this past week he's just seemed really off and doesn't seem as interested takes forever to reply back to texts if at all and has been a bit arsey towards me. Even though we have only been together a month we have spent alot of time together and he has said he likes me I just dunno what to make of him at the moment I really like him too I dunno whether it's just him wanting a bit of space, has gone totally off me or something else is up or how to approach him any ideas?

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