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Life for you doesn't really sound all that bad. Yes, breaking up sucks, for sure. The guy left you and/but you're still somewhat in love with your ex. You aren't taking your ex's calls or advances but in time, you'll get the itch to hook up with him.
A word of advice: don't date the ex for AT LEAST six months, maybe more (Dr. Joy Browne has a twelve-month rule, but I wonder if anyone can handle that). What I mean here is don't fuck him, blow him, have sex with him, don't answer his booty calls in the future. Purely platonic, casual relationship, is what you need, but be perfectly honest with him. Tell him you're worth waiting for.
You need time for yourself to sort it out. You'll get through it and it will be good experience. There are MUCH worse things that can happen to you and you certainly will learn this. But, you got to suck it up and be disciplined with your heart and head.