If you weren’t honest in how you felt, there’s a chance that he wasn’t either. Or perhaps he’s missed you and his mind has changed on the relationship issue. It’s therefore important that you be candid with him about your feelings and what you want in a relationship. Be true to yourself so that you don’t have to wonder any longer.
Also, be clear what behavior you will tolerate, and spell it out. Are you truly okay with letting him have “side chicks” on you or being one yourself if he currently has a girlfriend? People will look to you for direction on how to treat them. Respect yourself and don’t sell yourself short.
If this were me, I’d tell him how I felt, and if he wasn’t ready to date only me, I’d tell him to give me a call if and when he ever comes around and wants to have a real relationship – hopefully, it won’t still be too late. Then I wouldn’t contact him or play games. Let him decide whether he’s going to be immature by dating everyone he can or if he’s ready to be in a one-on-one relationship. He might not be ready. At least that’s honest. He may come back to you in 5 years, and you may or may not have outgrown him by then.