Wow, some men, just wow!

So, when I was 22 years old, I went on a date with a 38 year old man and fell head over heels in love over the course of the next year. He had one ex wife, 40 (and child), and one ex fiancé, 43 (and child), but he assured me both relationships were over and done and that we were exclusive. Well, about a year in, he has proposed, but is constantly cancelling dates, is only calling once a week, is taking days to text back, so I called things off. I loved him, but not enough to be a 23 year old waiting by the phone.
Fast forward to last week (I am now 25) and I get a confrence call from the baby mamas. They want to know when this man and I officially split, when we last slept together, and why exactly we broke up. I responded as politely as possible, but, those details are private. Turns out, the reason he was cancelling on me was he was playing happy little family with both of them at the same time. AND after we broke up, he took on two new mistresses! 
I always had my suspicions, so I am not surprised, but, good god! Where do some men get off thinking behavior like that is acceptable?! Sorry, just venting, it's hard to talk to people in my life about the whole thing because it is just so absurd!