After Greencard

Hey guys, it's been a long run for me and I just need some opinions from you fellow members.

My temporary/conditional greencard expires January 2020 so I need to start filing for removal. Me and wife had some ups and downs. We both have a bachelors and currently working. However, my wife is a very jealous person and about 10 months ago, she called the cops on me for allegedly hitting her. I was sleeping, she went through my phone, woke me up, starting crying (so her make up was all over the place), I told her I'm leaving and she said if I leave she's calling the cops. She calls her mom, asks "should I call the cops", then she calls the cops, the cops arrest me for hitting her because her makeup was smeared. My wife even said she doesn't want to press charges but there is a law that if someone calls for help, someone has to be arrested even without pressing charges. The case was dismissed for "lack of evidence". I never had a court date, never went to court, it was never filed. The intake attorney requested it for dismissal.. However, the arrest record is still on my record and I cannot expunge until two years after the arrest date. Obviously, I am not going to lie to immigration and will file all the paperwork I have from court. However; how do you think this affects me? I asked my lawyer and he said "it's hard to say". Me and wife are good now, we literally moved back in two days after the incident. I even traveled outside the country (after case was dismissed) and had no issues. My heart just hurts a lot because I have never been arrested before and it was the most hurtful thing I have been through.