Granted, exclusivity wasn't completely expressed, but when you start bringing a woman home to meet your family and tout that as a big deal, it would normally stand to reason that he was being exclusive with you!
I haven't spelt out this word in quite some time, but um....
R-U-N!!!
I am so sorry, that you ended up realizing what a butt clown he truly is!!
Hearts can mend, and right now, is a good of a start as any to helping yourself mend!!!