This is my definition of soulmate

Soulmate /soldm8/ n Someone who can bring out the best and worst in me and still love me for who I am, vice versa; someone who can strip me bare naked (not in the literal sense o'course) and see right through me; someone whom I can safely and conveniently share a space with and be totally cool with my weird habits (if any, yet to develop).

Top to bottom, perfect fit.