He broke up with me because we aren’t compatible. Months after not talking why was he looking straight in my eyes when I was walking past him?

I say him recently after months of not talking with him. He was sitting down with his friend and I was walking past his table. He looked at me when I was walning towards him (I got nervous and looked down) I looked at him when When I was more closer to him and he was looking straight in my eyes with serious look on his facw

He broke up with me because we aren’t compatible. Months after not talking why was he looking straight in my eyes when I was walking past him?
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