After speaking to my lawyer, looks like she cant do anything, she has no evidence to incriminate me with anything, So as long as I decline to voluntarily give my DNA to the police. Although he said its unlikely the police would have even taken forensics into a case like this. I could even do this again, and still the police wont have 'probable cause' to arrest me, he said if the police keeps coming to your house, I could sue them as its vexatious.
The sad thing is I really liked this girl, and I'm not the person to like every tom, dick and harry that walks by. If cant have her, then screw her, I'm going to keep harassing her for as long as I can.