Emotions should be present but can not serve as a foundation for a strong relationship. It is silly to loose sleep, an appetite, be rude to the others just because she does not look at you. Another person should not be an idol who you worship. Put the pink glasses away and think carefully before considering to be in relationship.
View marriage eternally: This is the person I will stay for the rest of my life with. Marriage is a covenant. You are committed to love unconditionally, to be always faithful in good and in bad times. Ask yourself a question: if he gives me hard times now what the bad time is going to be like with him?
Love is not selfish. It never stops. Think what motives do you have regarding your relationship: do you think about your own satisfaction when he or she is close by or you are ready to serve with an open heart even when i am angry, tired, frustrated?