I don't think outright lying is a good idea, just my opinion.
If you want to maybe plant that seed in his mind, by telling him you are going out when he calls and you have to run, maybe that would work. And try to just ignore his constant messaging and calling, if you can. He is on the chase to get you back, now, and thinks it's just a matter of persuading you. He just doesn't yet get it that a whole he11 of a lot of work is going to have to be done first, before he can even start to believe he has a chance. Honestly, girl, you are in a great position here. You get to call your own shots. The future is in your hands. I wouldn't let him see any cracks in your determination.

vc