ANSWER - If you want me to be frank, I think the whole concept of selling "relationship kits" is nothing but a con that gives genuine practitioners of witchcraft a bad name. There are of course ways to reconcile a relationship with the use of magic but speaking for myself (and most witches) there would have to be a tangible link to both parties before such a working could be undertaken. I find the idea that a witch could seal a spell in a jar for it to be bought off the internet and used by somebody he/she has never met quite laughable. Should you ever meet a witch who can genuinely pull off a spell in such a manner, befriend her, she'll probably be the most powerful witch you'll ever meet... But I don't believe magic works like that. Magic needs a locking focus point - a taglock, even a name can be sufficient but to cast a spell with no focus to be used by an anonymous stranger is in my opinion beyond the plausibility
of actual magic and into the realm of fiction and fantasy.
Looking at the reconciliation of relationships from a non magical viewpoint I'd question whether there is that much value in pursuing a love that has already failed or faded once before. We sometimes get very fixed on the idea that one person will actualise our dreams but the rose coloured spectacles often overlook what went wrong in the first place. There is naturally a safety in seeking out a lost love as opposed to the challenge of finding new people to share your life with but mired in that safety is the danger that if things didn't work out the first time, chances are they won't work out this time either. By looking backwards are you not just setting yourself up for more of the same heartache?
You tell me you are mentally and physically exhausted and I believe you. However if fighting for your relationship is putting such a strain on you then consider what living in the relationship would do to you. I may be equally cynical but I doubt whether all this focus on your past is good for either your health or your happiness. Sometimes we have to know when to let go and if you read your own question back carefully you might agree with me that this time has come for you.
I would urge you, whatever choices you make in your personal life, not to look to magic for a quick fix on this. Love spells are some of the most complicated workings around and the reason they are so readily and cheaply available in kit form is down to the fact that the shelf versions don't actually work. Though to be fair nor do a lot of tailored love potions and love spells. To successfully generate a working involving the heart is to manipulate people at their deepest level. Not an easy spell to pull off. Nor I feel I must point out is it a very moral area of magic. I'd hate to think my relationship was built on the basis of manipulation and I'm sure most other people would do. It's "doable" of course and you probably could get a respectable witch or magical practitioner to pull it off for you. But it won't be a bottle costing £4.99 on a pagan shop shelf, that much I can tell you!