Often, redemption can be a theme. Maybe one of the characters has had a difficult past, but through the love of the other person, they find a way to heal. Also, the theme of sacrifice is present sometimes. For instance, a character might sacrifice their own career opportunity to be with the one they love. This shows the depth of their feelings in the short love story.
A prevalent theme is the power of communication. In short love stories, when the characters communicate openly and honestly, their relationship thrives. It could be as simple as sharing their daily lives or deeper fears and dreams. Additionally, the idea of growth within a relationship is common. As the two people in the love story get to know each other, they also grow as individuals.
One common theme is unexpected encounters. Just like in the story where two strangers meet by chance and fall in love. Another theme is the discovery of shared interests. For example, when two people find out they both love a certain type of music or literature. It brings them closer together.