this sort of sounds like the plot to Practical Magic.
i'd be cautious with the above email address. i'm not saying it's a scam, just be careful. how old is this curse, who did it, more history would be nice. a lot of the time it's how much power you put into the curse, maybe woman break up with their boyfriend/husbands because they weren't right for each other, but by blaming a curse, you ease the hurt, but also give strength to it. just another option is all. each of you could try a purification and dispelling. or maybe when you do find someone, bit extreme, but do a binding to try and counteract it. but i'd go with the first two suggestion if i were you.