just have sex with him...for fun only..both of u can have fun together...
dude..this is 21st century....all people are open minded...maybe he wanna something that only u have it...
maybe u are his bestfren...only bestfren know better bout our fren...
btw, i know u have feeling with this boy..dun regret if this is the only time u can have sex with the boy..perhaps after this the boy dump her gf and want to couple with u....
maybe his gf is just for fun only...u r the only person he love...