Kei,
If you want to keep your marriage then work on it. Love is a verb. The feeling of love is when you two were going through the stars-in-the-eyes emotional feeling phase. Now it’s work. It’s a day-to-day conscious focus. It’s like with your children. There are days when they are little shits but you still love them. You hug them. You tuck them into bed. You read them stories. You go to their school activities. It’s no different with your wife. Love is active.
You may crush on someone else. That’s understandable. We all have fantasies that the grass is greener on the other side of the fence. We can project onto another person that she is more exciting and more desirable.
It’s your decision. This is what being mature is all about. It is knowing the difference between being infatuated with a fantasy versus wanting to do the sometimes hard work on a relationship. Court your wife again. Make a conscious effort to show/say that you love her. Take time to be present with her, to really listen to her. Give her a break from the children. I assume that she is the primary caregiver. Give her time for herself. Support her with her dreams, her hobbies. Have regular dates with her.
Mark