Wow! I started reading this the other day and was coming up with various questions and pieces of advice to share when I finished, only to find that both relationships are now over! One thing, anyway, kinda personal -- did Knight have an even slightly larger than average penis? Wow, that sounded messed up. I ask because I've been with more than one man who was surprised to find out that XL condoms fit them better... they'd never thought to try them, but had better experiences once they did.
Best of luck as you go on from here. I don't think you should be embarrassed. Ending a relationship is hard, but I saw a number of red flags with you and Romeo, most significantly him having no idea how to articulate why he would want to stay with you.