are much more meaningful than whether two people face each other while sleeping.
If you and your partner communicate openly, support one another, enjoy spending time together, and feel emotionally connected, sleeping back-to-back is unlikely to be a problem by itself.
Conclusion
When your partner sleeps with their back toward you, it does not automatically mean that they are emotionally distant or unhappy in the relationship.
The position may simply reflect comfort, personal preference, temperature, or unconscious movement during sleep.
If the sleeping position is part of a larger pattern