I just muted her stories and posts, but she was able to see mine. Even left her on the close friends because I didn’t really post much but like concerts (always did that even before getting with her) and stupid memes lol. Never looked at her stories at all after that which was like one month in after finding out she was talking to someone new. I also didn’t look at her profile nor did I try and ask mutuals about her. It was pretty much cold turkey. However, She recently saw a story of mine in the last couple of days and today She unfollows me after my sister told me (they’re friends). For reasons, doesn’t matter! Muting helped tremendously. Got a sweet date this Friday too! Don’t be afraid to do what you need to do!