Dae was you're best friend's boyfriend. Your best friend (Abbygail) introduced him to you, well since she did he became flirty towards you whenever Abbygail wasn't around.

And Abbygail once said shitty things to you before so you decided to get revenge and hook up with Dae.

You came over Dae's house to "talk" about something, when you came he suddenly pulled you in his room taking off his clothes, you tried to push him, you failed so you kissed him back, the two of you started to make out. Abbygail went inside his room and saw the two of you in shock