Not all chassdim sign tenoyim at the vort. In my chassidus we do sign at the wedding.
But even after tenoyim is signed, its not that u CANT break the shidduch. I’ve heard of that already. Its just that a broken engagement is much worse than a divorce since it involves much more humiliation.
(Please think twice before breaking a shidduch. Maybe it does pay to get married and try it out) please don’t attack me, I don’t know anyones situation but if possible, it is better to get married and divorce than break a shidduch.
Hatzlacha rabbah to everyone