Philophobia: fear of emotional attachment; fear of being in, or falling in love. There is no real love to be found in toxic relationships, and the only emotional attachment you will form will be an unhealthy one.
What about Fear of water? Phobias: xenophobia definition is a bit simplistic; yes 'strangers' but also more towards the fear of foreigners. Usually, used socially and culturally than just 'strangers' but I digress.