Hello Devon,
It seems as if you are being cornered by the primal aspect of self. The large lizards (lethal), represent the most ancient drives that are alive within. These drives are relentless in their pursuit to be satisfied, regardless of the perils as you see in your dream.
What I am saying is that you dream helps you to bring to consciousness, the concept, that in order to love you must lower the natural emotional barriers, and in so doing, the probabilities of being emotionally isolated or obliterated raise. The dump (having been dumped or understanding the emotional pain and desolation of being dumped by the one that you love), and yet you have the fortitude to brave the sexual drive that could leave you in such isolation once again. The natural "need" to procreate wins out.
As well, this drive is capable of negatively affecting those we are physically involved with, if we allow it to dominate the relationship (overdoing things).
Regards,
sailrmc