p.s.--I just saw Merrioc's post and felt I should comment.
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Be positive and happy when that's how you are feeling...but it's more important to be honest with your partner...otherwise they're not going to want to be honest with you about sharing their doubts/sadness/etc. And it's important for them to be able to share in order to move through depression and get on w/ life. That's just my opinion though.