Why did the skin of my tomatoes fracture after a few days in a refrigerator?
Tomato Gardening Tips
This site's gardening tip says that tomatoes splitting on the vine is due to a lack of water - the plant gets dried out and the skin doesn't retain the elasticity to contain new growth. 

The refrigerator is typically a dehydrating environment. Could be that's your culprit.

But for pity's sake, store them on the counter where they stay their most delicious and you can see them and remember to eat them!