A Quick Guide to Nice Guy(TM) Responses (aka You Can't Win):
Act friendly: "She lead me on! Bitch!"
Don't act friendly: "She didn't give me a chance! Bitch!"
Let them down nicely: "Well she said 'not right now', so I'll keep trying 'til she changes her mind."
Flat-out say no: "What?! But I'm so nice! What a bitch! I'll keep trying 'til she changes her mind because she OWES me now."
Date someone else: "Ugh, women only date jerks!"
Don't date someone else: "Hello?! You clearly are single and so am I, why aren't we naked yet?"
Marry someone else, have baby, die tragically fighting Voldemort: "Now I will torture her emotionally and physically abused son because I loved her so much and she married that jackass Potter instead!"