Don't allow yourself to get played by him any longer, infact he's not even being clever with his lies!
I had to do the degrading thing of confessing the full extent of my situation to my parents as I was being so lame with NC, I'd turned into a weak fool, extending and re-extending deadlines, consequently my Dad confiscated my phone (permanently), answered MM's calls and told him in no uncertain terms to stay well away from me whilst still living with his wife. This has been really effective and I feel a million times better.
I really feel if you are being persistently bugged by him and you are falling into the cycle of bull sh*t time and time again the best thing to do is either (a) involve someone he wont mess with or (b) change your number.
If you work with him, change jobs, Personally I would put creating the opportunity for a healthy, normal relationship as more important than career.
Best of luck cjanee, really hope you can shake him off soon and find the amazing, funny, hot single guy who is out there somewhere waiting for you (and when you find him, send his twin brother in my direction!


)