This situation may lead to insecurity in relationship and could be the cause of problems and their path may divert into two different directions soon.
In no way does this signify a drop in his passion for the relationship. The Pisces woman on the other hand is dreamy and full of fantasies.
He has to be strong to support her and make her come out from her imaginations and insecurities.
Discuss with her in a philosophical manner – which is liked by both and will make her get closer to you.
Your search is to find the essence and soul of love. Your heart rules over your head so a wise, matured and strong minded person would prove to be the best partner for you.
When you both are together: Sagittarius is fiery mute whereas Pisces is watery mute. Pisces woman is easily influenced by the environment and that may make her complex sometimes which is difficult for Sagittarius man to figure it out.