When you have problems in your love life and your friend/relative attributes them to your insecure nature, you mostly dismiss it off as love or obsession. At that time, you would probably ask yourself, "How can insecurity ruin a relationship?". Well, it certainly does. Your insecure nature may stem from a number of facts. Do you think that you deserve to be loved? This is an important element in a healthy and long-lasting relation. Many people struggle with feelings of self-doubt and insecurity, but these negative emotions plague some people more than others.
Overly Jealous Nature
The slightest hint of a connection between your significant other and someone else could drive you to outright accusations against them. It is not fair to expect him or her to cease all communications with everyone else, and you should not be comparing yourself to every person that they come in contact with. They are with you for a reason, and you should feel good about that.
Difficulty to Open Up
Some people feel that if they revealed whom they truly are inside, they would be rejected. There is always a risk of this happening, but anyone who doesn't love you for who you truly are, should be with you anyway. Emotional intimacy is important in healthy relations, and you are only driving the other person away by not letting them really get to know you.
Thoughts of your partner cheating on you or leaving you can plague your mind and practically torture you. It can get to the point where you think they are lying to you when they are not, and you can make fault assumptions about their character based on suspicion that is completely unjustified. This can hurt your partner, or even make them angry. It is frustrating to try to be loving and faithful to someone who doesn't believe that you are sincere.
Insecure people sometimes put themselves down in front of others. This is a defense tactic that they use to protect themselves against other people putting them down. It can simply be unattractive, and it is easy to lose interest in someone who doesn't believe that they are interesting, good, appealing, and pleasantly unique.
Difficulty to Accept Love
It is really hurtful when someone you care for doesn't accept your love. If you reject someone because you think that you aren't good enough for them, it hurts just the same as any other reason. They think that you are special and that you deserve the affection and attention. Take their word for it, and embrace their acts of love.
Overcoming self-doubts can be really difficult, but you don't have to do it alone. You can talk it out and learn how to love yourself. Once you understand what it means to love yourself, you can love others amazingly. That is a huge factor in having good relationships of any kind. Take the steps to let go of your insecurities, and embrace what love has to offer you.