Most people are on their "best" behavior early on in a relationship, so it can take a while for certain secrets, habits, or quirks to become apparent to a partner. Or maybe that partner just isn't paying close attention. Either way, don't assume you know everything about the person you've been dating, sleeping with, or even living with, for months, or years. Love is full of surprises!
Someone asked Reddit: "What's something about your boyfriend/girlfriend that you didn't know until waaaay too late in the relationship?"
1.) From ilikesalad:
My ex was going through a trial during our first summer of dating. I didn't understand why he wouldn't leave his house or why he had to be home at a certain time. I found out he was on house arrest