My ex of 2 years was dating another woman while was with me. why didn't broke up before?

Anonymous

I had 2 years relationship with my ex. Was quite serious. Our family knew each other and we were to engage. two last months I notice that he follows and unfollows constantly a girl. When I asked about her he said to me that was a friend from college. The last month that we were together he didn't follow her but became distant from me. We eventually broke up and now someone said to me that he was dating her.
Now that I figured out he was dating her before, after my back. now that are together, following each other again.
Why he just didn't break up with me first? I feel betrayed and stupid.

My ex of 2 years was dating another woman while was with me. why didn't broke up before?
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