Why is my ex boyfriend still nervous when he sees me? He still gets aroused when I talk to him but says doesn't want a relationship?

Why is he getting nervous/aroused when we're talking if he doesn't want a relationship any more? I broke up with him first but when I wanted him back he rejected me.
Why is my ex boyfriend still nervous when he sees me? He still gets aroused when I talk to him but says doesn't want a relationship?
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