Have Relationship Questions? Ask a Counsellor for Answers ASAP
Hi, I hope I can offer some help with your question.
I think it is probably fair to say that everyone will do this to some extent at some time or another. Being in a happy and fulfilling relationship can sometimes even be enhanced by thoughts or fantasies of other people. The extent of these thoughts and feeligs will determine the extent to which this could become an issue for you or the relationship, for example if you have deeper feelings about the other person., or you wanted to further pursue these feelings, however just fleeting thoughts isn't that unusual, and doesn't need to be any more than that.
I do hope that provides a different perspective on your situation and question, but do let me know if I can offer any further help.