What is the ruling on vowing not to marry a short person, and can I marry him if I love him?

This type of vow does not necessitate fulfillment. The vow that must be fulfilled is one related to a recommended act, such as supererogatory prayers, reciting the Quran, voluntary fasting, or charity. Therefore, you can marry this person, and nothing is required of you by marrying him. However, if you were to offer expiation for an oath, it would be better as a way to resolve the difference of opinion.