So a few months ago my gf and I traveled out to her parents town to be able to see her sister be baptized and for her to get family pictures. Anyways, through some very poorly and not concrete texts we had decided that I would stay out in their motor home as they had no room inside and that my girlfriend could sleep with her little sister. 

So everything was good until it was about time to go to bed. Now I had been dealing with an ulcer which gave me incredible heartburn and I would constantly wake up at night in incredible pain and have to take xantax to calm the pain. Since I was staying outside and I knew they would most likely lock the doors I asked my gf to ask her dad if there was a way I would be able to get inside, for instance the door code, if I needed to use the bathroom or take my medicine. To which he responded that he "didn't know the password and to ask her (step) mom." Now this was weird because how could the guy that could look at the camera for the doorbell not know the password?

Anyways, we didn't think too much about it, and decided to go get me settled in the motorhome and watch Netflix. We also texted her mom and asked her the same thing to which she responded that she didn't know and to ask her dad. Now this was confusing, and honestly I was getting pretty upset. 

Now to preface this, we had tried to come to house early where we were locked out and her sister(18) was able to come home and unlock the door with the password. We asked if we could know the password and she said no because it was her password.

So fast forward, we ended falling asleep, and I woke up at 4 with terrible heartburn and was unable to get inside so we both just stayed out in the motorhome. Cue the morning, where we received texts from her stepmother on how disappointed she was in my gf and wouldn't accept any apology.

So not only, was I tired and sick but now I was angry because we had been lied to and then treated like children. So I, in my infinite wisdom, decided I was going to let her mother know of my disdain. I was riled up. When we went to door I shook the handle and then knocked. When her sister answered she said you couldve just knocked or rang the door bell. I said something disenchanted. Ended up getting into an argument with her mother who said that she was blameless and put it all on my gf for making her out to be the "evil stepmom". I ended up leaving the house in a fury because they would not budge. 

Now they keep holding it over my head even though I apologized to the mother.  I am now engaged to my gf and they have told lie after lie to try to break us up. 

TL;DR gfs parents locked us out of the house with no way to get back in, I got mad, they accept no responsibility and keep holding it over my head. 