Why do you think my ex just ghosted me after lying to me about being engaged and cheating on his fiancé with me for months?

My ex and I have been on and off for 10 years. (17-27)

I found out the truth after seeing his girlfriend post a photo of them buying a house together and sent this message:

‘I’m so confused about everything now. I don’t want to fuck anything up for you. I’m just feeling so confused.’

Then poof the asshole ghosted me. I keep over thinking everything and wishing I never said anything. I already feel like an idiot and the fact that he just ignored me after everything made me feel the lowest I’ve ever felt in my life.

I don’t understand how you could tell someone you love, miss, want them, sleep with them for almost a year while being in the middle of buying a house and getting engaged to someone else.

What was I to him? Why did he just ghost?
Why do you think my ex just ghosted me after lying to me about being engaged and cheating on his fiancé with me for months?
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