There is nothing wrong with being Ok single. But yes, DO examine your thoughts and feelings more before jumping ship from the relationship.

You may have unresolved issues from past relationships that are making you fearful. Unresolved issues do creep into to the next relationship.

Do you have a therapist? It may be helpful to work through this with a T before deciding to do anything drastic. You may regret it later if you lose a good relationship. That would be my main concern.