Six year relationship, need help :(

Hey everyone,

I appreciate you taking time to read this. I'm having a tough time right now trying to decide where my relationship is going, and I'd love your advice.

I've been with my boyfriend for six years. We met in our early 20s, and it felt like marriage was on the horizon.

The relationship he was in beforehand ended badly. His ex ghosted him, and he's felt frustrated ever since for not receiving closure and knowing why she left him. We talked about that feeling openly three years ago. He's a loving guy, and up until today I trusted him %100. I support both of us financially, and love him a lot.

Recently his phone broke so he's been using mine to check Facebook. I got a notification that he had messaged this ex. It started off as an apology (though she ghosted him, and treated him poorly?) but quickly morphed into something really inappropriate. He wanted to meet up with her, and she talked about how fondly she remembers him and how he embraced her. He said he definitely only had fond memories of her (which is a lie) and how it'd been to long since they'd seen each other. He never mentioned me in the conversation, even when talking about all his life changes in six years. When I calmly confronted him about it, he acknowledged the inappropriateness of the conversation. I'm angry. I feel like a boundary was crossed. I don't have a problem with him talking to his ex but this seemed indicative of a bigger problem with our relationship that I hadn't been aware of. What do you guys think? Am I just over reacting? 😞