ihear – in truth I am not on a level to state my opinion, but non the less this what I would think. Hopefully I will not steer you in the wrong direction.
We see that Hashem “lied” to Avraham about what Sarah Imeinu said. Why? Because of Shalom Bias. We can learn from here that not every truth should be told.
However, in a case of marriage it really depends if that information will affect the marriage if not told prior. Therefore, a reliable posek should be consulted. May Hashem guide you to receive the correct psak.