I tend to agree with golden_eye. The OP is acting selfish, even if they do not intend to do so. It may not be a nice thing to say, but the OP needs to hear it. Contemplating whether or not they should keep dating this person or thinking of how they can maintain a relationship when their ultimate goal is to commit suicide is...selfish. Say this relationship ended up working, and OP fell pregnant. OP has expressed strong desires to commit suicide which shouldn't be taken lightly. How is a mother who wants to constantly die going to properly parent their child? What if the pregnancy increases the OP's depression so severely that OP commits suicide while pregnant?

The OP needs to end this relationship immediately and seek treatment.