Wasted relationship

This would be one of my rare personal topics in blog land. I wasn't going to share and let the world judge me and my situation but I thought I need it just to confirm whether my decision is right or wrong.

Here's the situation: the ex of whom I'm having a relationship with got hold of him through "kik", they talked and from the transcripts (of which I won't go into detail), they're very excited and she still calls him baby. (She left him for a millionaire with multiple businesses world wide, married him and living in the high nines). They have 30 years difference and from what I gather she misses my partner so much specially in bed.

Imagine my shock reading their conversations.

This went on for a week. He never mentioned to me about it. The worst part is he acted as though I don't exist, let alone in a relationship.

Note: I terminated our relationship and he's fighting so hard to save it. Explaining that that isn't cheating.

We're just over three years and would have been married but thank God, we're not. We are planning on buying a house together. Just couldn't make up our minds if in California or in Mid West



How do you feel, if it were you? We've been together as a couple talking about forever.

Thanks all for your reads and comments if any.

2nd Note: he'd been confirmed cheater and womanizer. However, with me, professing to have changed.

Last NOTE: I accidentally discovered the conversation. He's in the living room while I was in the bedroom where he charges his phone. It beeped and in his business, it's important for him to respond right away. My shock to realize it's his ex. I'm not spying nor snooping. Lol I think when I trust a person, I trust and not worried about what they do to hurt the relationship.