Think about those times when you passed an unfair judgment on someone merely because they reminded you of someone from your past who treated you poorly. Sadly, some people pass judgments like these throughout the entire duration of their long-term relationships. Simply because they were once in a relationship with someone who was abusive, dishonest, or who left them, they respond defensively to everyone else who gets close to them, even though these new relationships have been nothing but kind and supportive.
If you carry old bricks from the failed relationships of your past to your present relationships, you will build the same flawed structures that fell apart before. So if you suspect that you have been making unfair comparisons between your present relationships and a negative one from the past, take a moment and consciously reflect on the hurtful qualities of this old, negative relationship, and then think of all the ways your present relationships differ. This small exercise will help you let go of the old bricks and remind you that past pains are not indicative of present possibilities.