keep it on a low profile ... but you do realize that if something bad happens you cant turn to them ... meaning if he "breaks your heart " and they see you crying for days ... then they'll feel betrayed that you broke their trust and they'll like you even less than if you would have told the truth . so either you lie all the time to them even if you brake up (if you do end up with him ... marriage ... then they'll probably hate you for a while because you lied to them all this time , and then your dad might REALLY have a heart attack) ... but if you face it now it would prove your more mature and can handle some heat ... not be some baby hiding and lying all the way .