Jupiter Conjunct Saturn
The conjunction of Jupiter and Saturn in the composite chart may have more than one effect. On the one hand, it can make a relationship very unstable and changeable. In this case the two of you seem unable to go forward or backward on any issue, so that you constantly vacillate between the alternative possibilities.
On the other hand, in a reasonably stable relationship, these two planets can achieve an equilibrium. The outgoing, expansive quality of Jupiter can be checked by the carefulness and caution of Saturn, so that you become cautiously optimistic in your dealings with each other.
At the same time, since the idealism of Jupiter is tempered by the pragmatism of Saturn, you accept each other as you are and do not make too many additional demands. You may not think that this relationship is perfect, but on the other hand you don't really believe such perfection exists, so you do not demand it.
By itself, this is not an aspect that can make or break a relationship. It will strengthen a good one and make a weak one more unstable.