Should I have not threw him under the bus?

This guy i was seeing cut me off bc he cannot trust me anymore for what i did to him in the past. we got into a fight and i threw him under the bus to his friend. We both gossiped about his friend but i only told her what he said and not what i said. That was months ago but he has lost trust from me since and decided he wants to stop contacting me. We were fine but its been on his mind that he can't trust me and its been taking up space in his head. But when i did throw him under the bus we weren't on good terms and i was blocked.

Should I have not threw him under the bus?
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