Unfortunately, this is panning out as I suspected. It didn't take long for police to arrest MS on suspicion of kidnap, surely a tip off? (If they had concrete evidence - CCTV, forensics etc - they would have charged him).
I believe the police were following up a strong lead(s) from the start and deliberately seeded selected information to the media (just unfortunate that some people are too ignorant, lazy or stupid to assimilate the facts before posting on SM).
I wonder whether SE called off her wedding because she had feelings (or full-blown affair) with MS? Maybe the ex's mother's empty house was another place they used to meet? Maybe she called it off and MS couldn't take it? Or she discovered she was pregnant and he panicked? (One thing that has struck me is that she seems larger in the CCTV image than she appears in all the other photos - appreciate the images could be from some time ago, but even her wedding dress looks about a size 14. Having said that, it could just be a bad angle).
But maybe she just had cold feet about her wedding and was happy being single, and MS flipped after she spurned his advances. I find it hard to believe that the timings of the wedding dress going up for sale and MS working on her garden are purely coincidental, but this doesn't negate the last hypothesis.
Anyway, I'm sorry for the rambling stream of consciousness - I don't get the opportunity to post very often so tend to store it all up then splurge!
I feel very sad for her family and friends, but as others have posted, I'm glad that her disappearance has been solved quickly - however horrendous - and her body has been found.