krisu don't worry. if you had real relationship why worry? relax man
this is what i will take near me before interview.
1- photos of wedding ceremony at my home town.
2- photos of wedding ceremony at my wife's home town.
3- some e-mails from past that we called eachother "my love"
4- photo of my proposal
5- photos of our switzerland vacation
6- bank transactions that she sent me $3000 in 2011.
+1
I've seen people take their chat logs to the interview.
One thing that can help tremendously is a joint account with a substantial deposit.