Help me write this in a proper English “so this other day I exchanged words with this other gent telling me that he saw my ex boyfriend with another girl, so during that day the guy came at stadium to fetch me along the way I’m telling him that his ex friend told me that he saw him with another girl, the guy got angry he started questioning me why am I trusting people instead of him telling me all the truth he got angry so I was supposed to be the one apologising to him”

Sure! Here’s a revised version of your text in proper English:

"Recently, I had a conversation with a gentleman who mentioned that he saw my ex-boyfriend with another girl. Later that day, when the guy came to the stadium to pick me up, I mentioned what his friend had told me. He became angry and started questioning why I was trusting others instead of him, insisting that he should be the one to provide me with the truth. It felt like I was the one who needed to apologize to him."