Oliver is your ex. You both used to date for a long time secretly but broke up bc he misunderstood you that you cheated when you didn't.

After around 3 and half years. You went to your family dinner also to see your sister's fiancee but when you saw him your got shocked it was Oliver...hes your sister's finance...your guy bestfriend, Felix was also there he was your childhood bestfriend so his family knew yours so he came too. Oliver was just getting jealous of your and Felix's "closeness"