How do I get my ex back? HELP

I am a leo woman and I was in a serious relationship with a Cancer man for almost 2 years. Sometime in the middle of the relationship he broke up with me and exactly 1 month later he came begging me to take him back. We've had our share of arguements and everytime I threatened to break up with him he came crawling back. Once we began fighting and arguing sooo often I decided that we really needed time apart and I broke up with him. The next day I called him and picked up my stuff... he admitted to me that he was hoping I was actually coming by to get back together with him. He even called in sick to work because I guess it had a huge impact on him. After a couple of months passed I realized I was in love with him and we went out for coffee and I tried to get back with him. He told me he isn't sure what he wants and he doesn't know if he still loves me.

After being broken up with him for about 6 months I got with a new guy who I was with for only 4 months. I broke it off with the new guy because I am still crazy in love with the ex (cancer). My ex knows that I am single now and we talk once in a while but only when we run into one another on campus. I'm dying to get him back but I'm afraid of getting rejected. What should I do. How should I approach everything? Ohh and I forgot to mention his parents no longer want him to have anything to do with me...

After being broken up with him for about 6 months I got with a new guy who I was with for only 4 months. I broke it off with the new guy because I am still crazy in love with the ex (cancer).
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Well, you did the right thing by not even putting the "new" guy through all your baggage. That was an honorable thing to do for HIS sake because it wouldn't have been fair to him that you were still mentally attached to your ex, yet still on a journey to find someone new. I think you MISS your ex more than you actually NEED your ex. Sometimes, over time your love for someone gets even stronger, versus just decreasing and in this case, I think you should take a DEEP look into why you REALLY want this guy back. Is it because you are vulnerable & are more in love with the concept OF love versus the guy himself? Or it could be that self-consciously you might've left him when you weren't 100% sure that leaving was the best thing to do (thus making yourself believe that the 40th time you guys get back together, things will magically work out)? All I can say is, don't forget the REAL reason you 2 broke up. Instead of focusing strickly on HOW to get him back you should be focusing on WHY things didn't work out & WHY and HOW things even got to this point? When you change your focus, you might be suprised & end up with more content in your heart that you left when you did, BUT the key is to step away from the situation (completely remove yourself) and analyze everything. You have NOTHING to lose by backing away (after all, if it's meant to be, there should be no rush right?) but you have everything to lose by jumping back into a situation based off of vulnerability just to find yourself back in the exact same breaking-up-getting-back-together-again cycle (which is going to cost you more heartbreak in the end anyways)