His baby's mom messaged me saying to stop watching her. Should I respond?

My now ex boyfriend baby's mom messaged me saying that i should stop watching her every move about a man, her baby dad. Then she said that she hasn't seen nor spoke with him since June so there's no reason for me to drive pass her every month while she's walking because i'm creeping her out. 😂 the thing is i do watch her to see if she's talking to him; but i never say anything to her. Because I can WATCH whoever i want to. Should i respond back to her message?
His baby's mom messaged me saying to stop watching her. Should I respond?
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