Acting different?

My boyfriend and I have been dating for about a year and a four months. Lately he's just been acting different. He just doesn't seem like he did when we first started dating. I asked him if there was someone else but he denied and told me he loves me and he's just acting regular. Do you think he's cheating or someone else has his attention. Or do you think now we are just in the regular phase of the relationship.
Acting different?
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