Keep getting dumped for others?

I've been dumped a lot by girlfriends for other men and have been mostly ignored in general by women on a whole. I feel this has caused me to be very resistant to open up and be trusting right away in a new relationship. This in turn then makes my partners feel like I'm uninterested which then leads them to look elsewhere. Even though I explain that I move slow emotionally and have been hurt a lot in the past.
Keep getting dumped for others?
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