It's your decision whether you wish to continue in an unhealthy situation with someone who switches personalities and who becomes evil towards you for months at a time. Whatever you want to do is just fine, but I personally will not condone an unhealthy relationship. You're clinging to the good part, thinking this must be "it", and are not seeing what the bad part does to you and puts you through. And trust me, I know what it feels like to be in love with the good side of a person. I was there too. And it took me a long time to realize that it wasn't all of him.