If I was in your situation, the first thing I would do is make him feel discouraged about me in general by making his emotions toward me unpleasant. Instead of wanting me, I would want him to find me disgusting, deceitful, and annoying. I wouldn't want him to stir anger, so I wouldn't want him to hate me. I have my own ways, but the first popular spell that comes to mind would be a hoodoo sour jar on the relationship to sabotage your own (ex) relationship with him. Call me unconventional ;)
Then I would cast something on him specifically to attract women to him so that he gains opportunity elsewhere. A simple lust spell would suffice. But be sure the lust isn't on him, but those around him. If it is on him it could make him lust you, and that's no good. Also make sure it doesn't effect you. You don't want to start wanting him back.
Then I would banish him by severing the ties between you two, not just pushing him away.
I would work each one for a week. And I would let the first continue to run its course throughout the next two.
I don't cast at certain times of day. I cast when it feels right.
Here is an excellent spell I've used with success in the past (about 10 years ago) by Eileen Holland. The person is still out of my life.
"By the crimson and the gold By basilisk and brimstone By the garlic in the fields By the poppies and what they yield Invisibly I make my shield To detect thee and deflect thee And keep thy harm from me. By dragon?s blood and salamanders By horses when their hooves strike sparks By the dragon breathing flames From the Book Of Life I erase thy names I cut the cords and unlock the chains I sever all the ties by which we were bound And with impenetrable walls myself I surround Against thy power and its source And thy evil and its force Vesta, Pel?, Lilith, Kali Kali Kali I banish thee forever from me And any harm from thee to me Doubles back and tables turned Thou shalt by thyself be burned Lilith, Vesta, Pel? Kali Ma Kali Ma By the power of three times three I banish thee, I banish thee, I banish thee!"