Am I completely wasting me time? Or is this what its about?

I think you may have jumped into a new relationship too quickly after getting out of one that ended so badly. I think you enjoy the security and benefits of having a girlfriend but are scared to get hurt again which is why you say you are worried you are wasting your time. The thing you have to understand is that not every relationship is going to be the same and each girl you date will be different from the last. Don't base a current relationship on a past one and don't go into it with huge expectations. Take it slow, one day at a time. Have fun and enjoy the moment. You're really young and will probably get your heart broken many more times before finding that special person so go into each experience with an open mind and heart. If this one doesn't work out, remember, it's not the end of the world and instead of jumping into another relationship. Meet other girls, have fun, go out on dates, get to know different people before settling down with one. Make sure it's what you really want because remember, you are not the only one involved. The girl has feelings too and you must avoid hurting her as much as possible. It may not be your intention but it could happen nonetheless.

Feeling bad that your girlfriend cheated on you so you're thinking that MAYBE your ex will notice and she'll feel jealous? Hmm, my advice to you. Your ex isn't worth that, and this new girl probably wouldn't appreciate being used. But hey, you may have genuine feelings for her. So I don't know. Go free your mind, and open your heart, and find out what it is your feeling.