What Does It Sign If My Female Friend, With Whom I Am Not Sincere, Likes My Photos?

I have a female friend whom I know from my old job. I didn't have much sincerity. Then he added me on Instagram. He follows my stories and likes my photos. When I wished him a happy birthday last time, he responded with a heart emoji.

Do you think he might like me?

What Does It Sign If My Female Friend, With Whom I Am Not Sincere, Likes My Photos?
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