i don't think it was a publicity stunt, but I do think they rushed into it...especially as Preston was already engaged when he met her. Saying that though, a couple could be together 10 years before getting engaged, then get married and still split up as well. Sometimes it's just not meant to be.
It never looked like a perfect relationship (though no one other than those in it really knows what its like), they were soooo very different. As soon as they married Chantelle dyed her hair, started dressing grungy, wearing less make up...it was such a drastic change, obviously influenced by Preston. And then the boob job thing...! Maybe that was the straw that broke the camel's back...??
Anywho, its never nice when a relationship you believe in breaks down, so I say just best of luck to them both