There are plenty of reasons not to give out your "real" information when starting an online relationship. Even if you really are a single, stand-up kinda' person truly searching for a meaningful relationship, it pays to be sensible. However, you can be cautious without lying.

Don't wanna give your real name? Say so. Tell your prospective partner you're not comfortable with that yet and online you go by "insert alias here."

Don't wanna share your real birthday and age? Say so. "I'm in my early thirties, I prefer not to give an exact date."

There's no excuse for outright lies, and the fact that you're hurt and upset to the point of posting about this points to the fact you know something smells in Denmark, as they say. Good luck, I think in your heart you know how to proceed.