27 parts Complete MatureAfter accidently meeting, becoming roommates with someone who is soon to be your best friend but also someone you are crushing on, while that someone is seeing someone else hurts! Starting the cycle of jealousy, avoidance, pulling away from your best friend, and miscommunication. If only they realised it was mutual and they had discussed it.
Or a friends to lovers AU where Harry and Louis end up as roommates pining for each other. Harry thinks Louis has a boyfriend and Louis thinks Harry isn't interested.