What does it mean if a guy act like he likes you but his texting style has changed?

He acts like he really likes me but for the last months his texting style has changed. Before he would write me sentences as a response. Now he only writes me one word answers. And responds less. To his other friends, he still writes sentences. He acts more serious towards me but always checks me out and keeps staring.
What does it mean if a guy act like he likes you but his texting style has changed?
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