So... I am 23 year old student who was accused of sexual assault on a girl I seen 4 times. We met on Tinder (I know, I know...) and she seemed to me very nice and down to earth. 1st encounter: We went out for tea, had a little chat, kissed once and that was it. 2nd encounter: I visited her at school for about 30-40 minutes and we just walked around school and kissed again. 3rd encounter: We met on the street, walked to a cafe, had a drink and walked back to her car(my place was near said parking lot). She wanted to go the "bathroom". Usually girls do this to get into your apartment, but I dont know. She comes up, does her business and we end up on the sofa. We start kissing, feeling each other. We ended up in bed after 30 minutes, naked, but no intercourse has happened. She left after that since it was late. 4th and last encounter: She came up to my place to study and order some pizza, again, couch --> bed. This time though she was playing evil. She was rubbing my privates against hers(she was on top), but at the same time saying that she wants it, but we cant. After about 1 hour of this, she gets on her stomach and signals me to get on top of her. I ask her if she wanted it or not, and she said "yes" and also indicated with her body language(pushing her butt up) that she wants it. So it happened, but after 10 seconds, she pulled away and was motionless for 5-10 minutes(she might have regretted it) and she said she is thinking. After that she said she has to go home. I got her her clothes and she left. After leaving: I texted her, since I didn't understand what just happened and actually I was in a shock as well. I texted her if she wants to talk about it and that I was sorry(again in shock). She replied when she got home that she will be fine. I wasn't sure what happened so I tried to get to the end of it. After about 2-3 days, she sends me a text, that she doesn't want to see me again, and I shouldn't contact her either, since she cant trust me anymore. I said OK. Her last text was if I ever try to contact her again, she would charge me with said things. I got the point and deleted her from everywhere and didnt text,meet,call or anything. This Friday I got a call from the police to go and meet with them for a "talk". My question is: Should I go in? Should I get a lawyer? I have a clean record and never been involved in anything. The call came as a surprise since I did not force myself into/onto her in any way.

What do you men think?

EDIT: I am pretty much freaking out about this. Is there a possibility that I don't have to go into the station at all?

Thank you for all the support!

EDIT2: This is in Canada

EDIT3: I talked to a lawyer. Meeting with him instead of the police. I will update this post when I get more info.

EDIT4: The meeting with the lawyer. I met with a lawyer and told him the story. He took 5 pages of notes and the message logs of the conversation I had. He also said he will contact the detective. A day later he said that he has spoken to the detective and det.'s mind is still "open" on charging me. They want to hear my side of the story still before making a decision. Now we have to decide to talk or not.