It all comes out eventually. I mean you won't be able to hide major things like your depression if you two become partners and/or get married.

Communication? Its EXTREMELY important. No, I'm not saying that you have to be 1000% honest and disclose everything, but being open with your partner is pretty important for having a good relationship.

You can only show someone your good side for so long. (This is the root of the honeymoon period!) But on the flip side, true love doesn't come along until you love someone for ALL that they are, good and not so good!