If it fair not me to also not trust if I'm distrusted?

The way I fuction is simple:

If you don't trust me then why should I trust you? Why should I freely give you something you're unable to give me? I've dealt with someone that had relationship baggage and was very cautious. At the end, I shouldn't handle the distrust anymore and so break up. I didn't trust him becuase he didn't trust me. Just like he was so much into protecting his own interest and shielding himself, so was I. Why should only him be protected over himself and not me?

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+1 y
If I'm not trusted from the start if it fair for me to reciprocate in the same way, to be distrustful towards him too?
If it fair not me to also not trust if I'm distrusted?
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