Guys, how would you feel if your girlfriend did this? Am I in the wrong?

Guys, say you were with a girl for 3 years. She was a great girl, innocent type, 100% loyal to you and would do anything for you but she found out on social media that you had been seeing/flirting with other girls on the side and so she ended things with you with no explanation, how would you feel? This happened to me, and i dont think he deserves an explanation. He asked why i was ending things and what happened and i told him that “it doesn't matter and not to worry about it”. He knows what he's done and i dont feel the need to have to explain to him what he did. Am i being crazy immature and wrong? I genuinely want to know if im in the wrong so i can fix it and do whats right. Please no mean comments
Guys, how would you feel if your girlfriend did this? Am I in the wrong?
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