Why is he distant after sharing deep stuff?

He asked me once why I liked him. Last Friday I asked him what had interested him about me when we first met and he answered that who I am as a person, how I act in general and that he enjoys talking with me which for him is very rare, reason why he's been single for a while now. Next day he started acting a little bit different. He's still texting me sending me memes, but I feel something is different. (He's on holiday so we haven't seen each other in a couple days). Why could it be?
Why is he distant after sharing deep stuff?
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