Hello Pierrek,
I am so sorry you have experienced this.

It sounds like you are dealing with emotional abuse. When a person threatens to end their life that is an abusive effort to manipulate you and never okay in any siutation. In one post you said you don't need therapy because you see the goodness in people. Seeking therapy does not indicate weakness or looking for the worst in people. An experienced therapist could help you break down what's going on in your relationship, how to deal with it, and explore why you partnered with this person.
Abuse does not just get better in time as you suggested. Without professional intervention and consequences, abusive partners tend to become increasingly unhealthy over time. In some cases this can become physically dangerous. The emotional abuse you have already experienced is very harmful. Did you know that emotional abuse can affect your decision-making processes and judgment...leading you to accept behaviors and situations which are not okay. A therapist could really help you with that.
I encourage you to seriously consider a consultation with an experienced psychologist. With regard to why you are in the relationship...you may want to explore your relationship with yourself, self-esteem, your childhood experiences, and your parents' relationship. Our parents teach us how to treat ourselves. We also (often without even realizing) tend to partner with someone similar to the role model we had growing up. A man tends to partner with someone similar to his mother. A woman tends to partner with someone similar to her father. Not consciously though. Of course there can be exceptions but I am wondering how your mother treated you? How did your mother and father get along? These are all important considerations which can be explored with a professional therapist.
I am very concerned about you and the child of your partner. Please take some time to think this through. I need to be candid in telling you that if things continue as they are, I fear they will only get worse. I wish you peace and healing energy.