Feeling insecure in your relationship can be really painful and upsetting. It can manifest itself in all kinds of ways. You might feel like your partner is about to. Insecurity in a relationship can be difficult to handle, especially when your partner can't understand you and all you feel in love is confusing pain. Find out how to. My insecurity made me see problems where they didn't exist, turning what could have been a successful relationship into a short-lived, dismal failure. Know the.