My ex-girlfriend was great. Girl-next-door type, similar interests, could totally see a relationship lasting. Couple months into us dating, I drop her off at home where she lives with mom and dad. We think everyone is in bed, and we are making out in her hallway like we did at the end of every night when we notice her mom in the living room next to us watching us in the dark. Turns out she had done this before, and my girlfriend knew she would watch us. Dealbreaker.