I don't know, that may just be your body's natural process, and it may just be that intense for you, regardless of water breaking. Have you thought that maybe water breaks BECAUSE contractions are 1 minute apart? I don't know, just a thought.
My labors are very intense. Contractions start at 2 minutes apart and then just roll on top of each other. After a point, I only get get like 5-10 second breaks between them, which is kindof the max. And, for my first labor, they were like this, and water did not break (until midwife broke it after like 7 hours of that intensity, thinking things would progress quickly after, which they didn't because he was posterior -- ended up in hospital with pit and epidural and birth another 10 hours later), while for my second, they were like this too, where my water broke (well started to leak) at like 6 am and contractions didn't start until 7 pm (and baby was born 3hr15min later).