Why does my ex stare at me serious but won't talk or say hi to me when he said he wanted to be friends?

Jennajay1719
We were together for 1 month but he broke up with me a month ago because he thought I was unhappy since we didn't spend time together he kept saying he wanted to be friends for now until he can put time in relationship. After we broke up he would say hi first I would say hi but after when I would say hi he would say hi with or without smile. Now we walk pass each other not saying hi and it bugs me I want to fix it and give space but we see at work and it feels like he tries getting me jealous by giving others attention but me. I caught him staring at me today but he didn't look away he had a serious face. One coworker told me 2 weeks ago that he stares at me in a good way when Im not looking. I want to talk to him but have a lot of emotions going on which is why I try ignoring him but it feels like he gets my attention more by talking loud.
Why does my ex stare at me serious but won't talk or say hi to me when he said he wanted to be friends?
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