Less than 4 hours after we broke up, he messaged him ex. Counter argument: “well you broke up with me”. Am I bugging?

Anonymous
we’ve been together 1 and half years so far and we’re pretty serious. Except today we had a huge falling out over something completely different. I didn’t feel he heard me and valued what I was upset about. He felt hurt I went there and broke up with him. Both understandable. however… I find out that he messaged his ex within 6 hours, i confronted him when he was drunk, he told me he wanted to move on and said I’d find better (because when we fought I said mad people would love your place). He told me what the exchanged messages were but deleted them from him phone already. Now I’m at a standpoint because I understand he was hurt, I don’t know how you can message an ex…. Especially when we pretty serious with him talking about marriage and all that other shit. So what you think… should I stay or should I go.
Less than 4 hours after we broke up, he messaged him ex. Counter argument: “well you broke up with me”. Am I bugging?
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