make every effort to ask your partner "how's his/her day?" before going to bed.. to at least let her/him loosen the tension after such tiring day.. and never forget to say "i love you" before you sleep. simple and sweet gestures do matter a lot.
Good question. I think trust and care both are very important things that make your relationship strong after marriage. Believe on your partner fully and take care his/her. Share everything to each-other and express your all feelings with partner.