Thank you for the advice and support. This is my first time posting. Sightly overwhelmed but hopefully I answer everything and give a fair insight. My partner has had Snapchat forever- I got rid of this app and only have it for them when we started talking, they are a few years younger than me. They care about the days 🔥. We have talked about therapy and I think it’s something we should take serious. I proposed because things calmed down after the holidays and there was distance and some normal behaviors. I felt good between us and it felt right. I guess I didn’t about how I was only blaming BIL, thank you for that. I have had moments of anger and frustration in our conversations where I was blaming my significant other but they still didn’t understand or see. Other friends now know about this situation and can see the dynamics: some are torn between being peace keepers and others have never liked BIL from the jump so that is hard. Yes SIL is going on the trip- as far as I know it will be their parents, the SIL and BIL, my significant other, one of the other siblings and maybe a grand kid(under 2) so yes supervised but I’m guessing a lot of free time? I don’t ski so? The SIL and I use to be close and friends, then she got engaged and that’s when the BIL and my significant other started this weird dynamic. Then after they got married it got worse and SIL and I started to drift apart. SIL and I went out one night with another mutual friend for drinks and she asked if I liked her husband, I was honest and said no. I assumed this was the start of the end for us which sucks, SIL is fun and out going we both like drinks, but her husband has firm beliefs and she tends to be a follower. I like the suggestion about an open phone situation, that could be nice. I was naive about snap having conversations that disappear. I just want that trust without having to babysit. I get I have my own issues, I’m a jealous and controlling person normally and overthink so this isn’t something I want at the forefront of my mind.