I don’t understand myself :

I’m seeing a therapist, I have a job, a family, a girlfriend, but despite all that, a simple argument makes me ruminate for weeks, and I think about it several times a day with most of the times late at night or at the beginning of my day some suicidal thoughts.

My life has its uncertainties, sure, but I feel like I’m in a happy period of my life. So why do I feel this way?!