The love interest should represent the very thing the protagonist is afraid of or lacks. 2. The Three Dimensions of Chemistry
A relationship without conflict is a diary entry, not a story. You need two types:
This is the "magnetic" pull—the lingering looks or the awareness of the other person's space. 3. The "Meat" of the Story: Conflict
A moment where they see a side of the other person that no one else sees.