As I stated, cracks do come apart and close up. I have a stress crack above one interior door and it can be used as a season change barometer. It opens up in june and closes in Nov. If you fill it in too soon and it decides to close up, then you will stress another spot.
After a couple of seasons or in June of 03 patch the crack if you will and I rec to use a latex concrete patch. It will give to an extent and will work nicely for you.