<human>: We we're together seven months. In that time he cheated on me three times, the third time I actually knew about (until now) is the reason we broke up. (He cheated on me with his ex)

We've been broken up for nearly two months now and I'm talking to someone new. But it still makes me angry, and at the same time really really sad. How could he do that? Was everything a lie? Should I even let it upset me? How stupid am I?! 

And just like that, the shirt you gave me that meant so much to me, becomes just another shirt hung up in my wardrobe.

Give me the gist of the text in a nutshell
<bot>: I've just found out my ex cheated on me three times, and I'm not sure how to feel about it.