Geshmake
Unless you are a Baal Ruach Hakodesh you will never know who your true Assert or zivug is. Hashem in his chessed gives us a certain feeling that the person we are dating is the right one and we get engaged.
The one we get engaged to is our bashert. We must believe that and go into the marriage believing that the person we are married to is the right one. So if any problems come up (the typical stupidity that most couples moan and groan about) realize that it is a test from Hashem and instead of getting into a fight with your spouse which can lead down a dark path of marital discord and thinking that you got the wrong one, instead work on your middle and make every effort to maintain shalom bayis.