My GF’s younger sister snitched on her spending the night at my place

I’ve had a feeling my gf’s sister has not liked me for a while now. She’s continuously made jabs at me to her sister but when I’m with her she seems normal. She’s 18, I’m 25 and my gf is 24. We’ve been dating for 4 years now.

The main reason why I think she doesn’t like me is because of some mistakes I made in the first year of my relationship. This is my one and only long lasting relationship and my second one ever not counting my previous that lasted only 3 months. At that time I was extremely uncomfortable cutting people off and didn’t fully understand what being exclusive meant. I responded to my ex when she messaged me on ig in the first year of dating and naturally this hurt my gf so she vented to her sister. Ever since then she’s had it out for me and thinks I’m a horrible man. My gf and I talked about it, I didn’t want to hurt her and felt awful, she forgave me and I had learned a lesson the hard way about what being loyal and exclusive really meant. She gave me a second chance and I’ve made sure not to mess it up again.

This was 3 years ago now and throughout these years she’s consistently made playful jokes with truth behind them about how she feels about me to my gf. Things like getting annoyed when she hears I’m coming over to their house, or sending reels that express how to run when a red flag comes up from a boy. Now, our parents are both strict when it comes to relationships and boundaries, which means no unsupervised sleep overs, especially at my apartment or hers. We can only spend the night at her parents’ while they are there and her dad doesn’t go to bed until I do. Since both of our love languages are quality time and we only get to see each other maybe once or twice a month due to being 3 hours apart, we decided to try and sneak each other spending weekends together. Whether that was the right or wrong decision, I’m unsure of at this moment. Yes, it’s wrong to lie to your parents and your gf’s parents but long distance is really hard, especially when your love language is quality time. We did it out of fear of what may happen if we didn’t do it.

And of course last night she sleeps over but this morning we find out her sister snitched on us to her dad. I’m asking to have a discussion with my gf’s parents to fully explain our intentions, ask for their forgiveness, and show any amount of respect I can to them in this moment to make things right.

As for her sister, I thought we were good but I’m thinking I need to have an adult conversation with her too as to why she doesn’t like me and fully get it out. I do in fact care about all the relationships I have to her family but right now things are falling apart and I don’t really know what else to do or expect at this moment. I’m just hoping that with time these talks can be the beginning of healing for everyone…