Sag never knows what they really want from life and romantic relationship. They want to be a free spirit and have a loyal partner at the same time. They need to decide on their priorities and realize what is more important for them: adventure or a happy romance.
Moreover, Sagittarius promises a lot but seldom keeps their promises. Their words of eternal devotion are sweet and seem reliable, but when a real problem pops up they will run for their lives and abandon their partner. Sag needs to learn to be as good as their words before they can expect to build a healthy relationship.