I'm very sorry you've had to deal with that. Not sure if this helps but if they were quick to replace you, look at this way: that could show that they never valued you very much and probably don't even value their current romantic partner either. If they're so quick to replace one whenever one they think is better comes along then says a lot about how shitty of a partner they are. People like that usually end up alone in the end. You deserve better than that anyway. Hope you're able to overcome and can move on to find someone who will treat you better. 🤗