I'm not quite sure this is a Cancer thing but Ill take a stab at it.

Sounds to me like you need to read "It's Called a Breakup Because It's Broken" by Greg Behrendt. Seriously, if you're breaking up so much, the relationship sounds toxic anyway. He might have been pulling away because you were getting too clingy... and then you compounded it by going off the crazy deep end of clingy. We Cancers need our space -our alone time, our little cocoon like shells! If you've never shown him that level of insecurity before, then that could have been the crippling blow to your relationship, I hate to say. I'm a Cancer and the second someone starts clinging on to me, I make a beeline for the door or do things like your man did (with work) to push them away and get some space.

It sounds to me like you need to do a lot of work on yourself first before you try to have a relationship with anyone else. Once you can find your center and be confident and secure enough in yourself to not NEEEED to have him around, you might have a chance.

If he does come back, lay off the poor guy and give him some space. Find things for yourself to get heavily involved in as well. And make sure you have a good friend around to give you an emotional reality check-up every once in a while. What could seem so amazingly intense to you, could possibly not mean as much to him.

His Gemini venus (air) and Sag(fire) mars should clue you in on his need for space. Meanwhile, your jupiter in gemini makes it easy for you to enlarge his affections, you have an irresistible urge to give to his venus. Burt your Taurus Venus and Taurus Mars incline you to more stable,nesting type togetherness. Try homesharing with roommates or chill with your buds. He naturally needs to be out and about more than you.