Alright so firstly I?m going to put in my little disclaimer here. Sadly it seems to be a fact that whenever someone asks for help here they get inundated with private messages from ?powerful spell casters? who are willing to help out and cast a bunch of spells for you in exchange for a small fortune, do NOT pay for anyone to cast any spells for you. Ninety-nine percent of these individuals are frauds and will simply take your money and do absolutely nothing for you and I would be suspicious of anyone who is not willing to discuss their actions in the public forum. Spells work best if cast yourself and at least that way you know something is actually being done.
Now as for this specific case I don?t want to fill you with false hope. Binding spells, as with all magic, is metaphysical and whilst I wouldn't discount it from affecting things to keep the two of you apart I wouldn't completely rely on it either, what they can do is help prevent him from causing you further harm though which in turn may help to boost your confidence and help you move on from him. So as for the spells there is a plethora of methods you can use on the spells page here but when reading through them bear in mind that anyone can put them up and not everyone is at the same level of experience thus some may work better than others. I personally can?t speak for which spells may be best however I would always recommend researching and adapting one to your own needs. There are several popular methods involving poppets, candles, runes, etc and it?s really down to your personal preference on what works best.
You may also want to look into banishing spells which are typically used to repel something/someone in addition to bindings. Personally I've never attempted a banishing spell to affect the physical realm and only the metaphysical so I can?t vouch for their effectiveness but it may be worth a nosy into.