There are many people that have suffered a broken heart, and while some blame themselves, others hold the other person accountable. Looking into your failed relationships can help you learn things about yourself, and even prevent future repeated mistakes from happening ever again.
Looking back, you may discover that you tend to find partners that are emotionally unavailable. You may have wanted to seek more from the relationship but never were able to receive it because the other person left as soon as it got too serious. If you find yourself in this repeated situation you may be choosing these types of partners because deep down, you are afraid of intimacy. These people were chosen because you knew they would push for a deeper relationship.
Do you keep choosing people who take? Selfish partners are another common pattern in failed relationships. Choosing selfish people is a downfall to people that feel like they have been taken advantage of. Consider the aspect of receiving support. Does it make you feel vulnerable or uncomfortable? There is a balance needed in successful relationships of both giving and receiving, and it cannot be found in selfish partners.
Self-blame will not help you succeed in relationships and neither will blaming the other person help you in future relationship success. Take what you have learned about yourself and grow. Shifting to a new perspective and approach to relationships will yield results in you attracting better partners, and being a healthier partner as well.