I say date around. That way, if you get back together in the end, you'll know it was really meant to be. I think that would be more satisfying than always wondering if you only got married because you never dated anyone else...but maybe that's just me.
Timing doesn't sound right for you if you truely love each other that won't go away. keep in touch but you should still date and have fun you are both young if you still feel the same in 3.5yrs then you get back together.