If your girlfriend filed a police report, then you may be arrested and the police are not required to question you. It is possible the police may “invite” you to the police station for questioning in order to obtain more evidence. Often police will be very friendly initially before engaging in more aggressive questioning.
In particular, if the incident involved domestic violence, police will often purse the alleged perpetrator and attempt to arrest him or her as soon as possible.
At this point, the most important point for a person in this type of situation is to not make any statements to the police. Regardless of how nice or friendly the police are, it is critical that you ask for an attorney and refuse to engage in any questioning. If police leave you any messages, call your Criminal Lawyer in Buffalo NY so he or she can speak with the police on your behalf.