"We hurt others in order to hurt ourselves.
When we hurt one who is close to us, ultimately we hurt ourselves- because guilt, regret and shame can torment us long after the hurt is done.
But why would we do this?
This tendency is founded on core beliefs of inadequacy. When you believe you are actually unworthy of love, undeserving to be happy, unlovable, or that you are bound to ruin anything that is good for you, it is likely you will end up acting in ways to confirm these core beliefs- that you can’t really be happy or don’t deserve love."