First I totally agree with the advice that you have been given.
If you date someone else and proceed to divorce then your wife has GROUNDS against YOU. Believe me that is not a position you want to be in. She can claim that you are the one that committed adultry even if it is false, it is then up to you to prove it.
So the advice here is usually to wait 1 month for every year that you have been married. But the average MLC is 3-7 years so anything less than 3 years is very early.