Sure, try a break up spell. Here's the thing, and mind you, i'm not a big nay-sayer when it comes to "controversial" spells like love spells of curses, etc. In my view magic should be practical, i don't pay much mind to karma, etc., and i will usually counsel people to go for it if they feel strongly in the work. But to the disclaimer:
It has been my experience that when you do break-up work or other very controlling, very coercive love work, you very well might get your partner back, but the relationship will lose some of its original innocense - that's the best way i can describe it. If it's worth it to you, then go for it.
I'd do a bottle spell to break-up the couple. Make name papers for the two parties, add personal effects like hair, handwriting, etc., and put break-up botanicals like lemon peel and alum, sour liquids to sour the relationship (vinegar, urine, etc.), and sharp implements to sever the relationship: razor blades, glass shards, etc.
You'll need to do your research, so i'd suggest going online to www.LuckyMojo.com and searching terms like "bottle spell," "break-up spell," and "name papers," to get a better plan as far as the actual spellwork.
While you got this bottle o' nasty brewing, i'd make another jar, this time a love jar for you and your partner. Google "honey jar spell" and look for the Lucky Mojo page.
I'd do the break-up work first, starting on the waning moon, and then move to the fix-the-relationship work during the waxing moon. The honey jar might not be enough. Ginseng gave you a great bath recipe. Search the Lucky mojo site for more lover-return-to-me/reconciliation spellwork. You can also search my blog (located in my profile) for more spellwork plus some excellent (if i may say so) therapy-type advice on effecting a reconciliation; just earch under the reconciliation tag.
Lucky Mojo sells an awesome candle called a Divorce Candle which is perfect for break-up work. It's a black candle with a separated couple standing back to back. Awesomeness. You may also want to do some more searching for other break-up work. There's a great break-up trick using a lemon, placing the parties' names in the lemon, and letting the whole mess rot, but i'll let you find it in your research.
Best of luck, and may your Will comport with the Will of Spirit; otherwise this reconciliation is not meant to be, and Spirit has your perfect partner ready for you, someone better than your spouse, awaiting your heart to heal and move on towards him/her.