2. If you answered YES to both questions, then it's time to reach out. Be sure to keep your initial contact light and casual. Don't put pressure on him and, most importantly, on yourself. Leave a Facebook message such as, "It was great to see your name on Facebook! How are you?" The way he responds will give you a lot of clues on whether or not to go forward. If his answer is short, like, "I'm good. Hope everything's well with you." That's not a good sign. Ideally, he'll ask you questions about yourself and sound enthusiastic to have heard from you. If so, that's your signal to take things a step further.
4. All systems go? Time to suggest a low-key meet-up like going out for coffee or something neutral. You don't want to put too much of yourself out there until you are sure he's interest in a renewing his romance with you. Another idea would be to suggest a restaurant you both enjoyed, an art gallery you used to frequent, an activity, like biking or skiing, you both enjoyed. Going back to places that hold good memories will remind him of the great times you had together and rekindle old feelings.
6. Don't get carried away yet! Think about why things didn't work out the first time and look for signs that things will be different now. If you broke up because he spent too much time partying, notice how he acts when you're out. Pay attention to how much he drinks. How much does he talk about going out? The bad habits and routines that drove you apart should be done to make this retro romance a lasting one. Take things slow and most of all, trust your gut.