No, sounds completely odd to me. As much as we cared about each other, it was a professional working relationship. It isn't really a term I use, even with my husband. We are very individual. Probably the closest person I have in my life who truly is that much in sync with me would be my youngest son - our personalities are very similar, our interests are the same, our values are the same, we very much get each other most of the time, but I wouldn't call him my "soulmate" either.