Guilt

Trapped in guilt, I looked for scientific and psychological remarks to heal the pain. First study highlights the fact that 'The guilt [connected to the empathy] is more intense in women than in men in all groups studied,' followed by obvious explanation that this difference origins in evolution which has endowed women with neurochemicals that promote mothering, nurturing, and bonding; all three are required for Empathy.
Then, inquiring 'How can I deal with that?', I found some tips:

1. Recognize the kind of guilt and its purpose. Guilt works best to help us grow and mature when our behavior has been offensive or hurtful to others or ourselves. See whether it is "healthy" or "unhealthy" guilt. Healthy guilt serves a purpose in trying to redirect our moral or behavioral compass, whereas unhealthy guilt serves no rational purpose.
2. Make demands or changes sooner rather than later. Sooner learn the lesson, take action to fix the problem behavior, if it is healthy guilt.
3. Accept you did something wrong, but move on. You have to accept that you cannot change the past. Apologize, or make up for the inappropriate behavior in a timely manner, but then let it go.
4. Learning from our behavior. The feeling of guilt is trying to get our attention so that we can learn something from the experience. If we learn from our behavior, we will be less likely to do it in future.
5. Perfection does not exist in anyone. Nobody is perfect, even our friends or family-members who appear to lead perfect, guilt-free lives. Accept that you are only human.