Cheating??

So a friend of mine told me she heard my ex basically confess to cheating (( confessing his feelings to another girl while we were together and hanging out with other girls who he liked))to a friend. We’ve been dating for 6 months and I broke it off almost two months ago because I could tell he just wasn’t that interested in me anymore. Can anyone help me and give me advice on how to handle the news. I feel horrible and just found out about it today and I’m wondering if I’m being too dramatic by being upset about it.