conjunction reduction - Repeated elements following an “and”: Use ’em or Lose ’em?

Here is a sentence:

You have to be nice to alleviate the social anxiety and start a healthy relationship.

Should it be like that or like this:

You have to be nice to alleviate the social anxiety and to start a healthy relationship."

The first does not have a to, but the second does. Which should I use, and why? Or doesn’t it matter?