What is love ?

Hello! I’m currently in my first real relationship. We’re engaged and have a baby. I know that I love him and our family but more days than most I picture my future and he’s not in it. Some days I honestly wish I could meet someone new because it seems like we have nothing in common . I’m just curious if it’s normal to have these feelings in a long term relationship. Am I just bored? Am I supposed to ignore all these thoughts and feelings and push through because we’re a family? After the honeymoon phase is it normal to question the relationship? If love really is hard work and what I’m feeling is “normal” then I’ll stay with him forever. But if what I’m feeling isn’t “normal” then I’ll obviously talk with him about either changing things or separating. So I guess what I’m asking is for all you married women or couples that plan to spend the rest of your lives together, how would you define love? And the ups and downs in a relationship? When would you know it’s time to leave? Or when it’s time to work harder in the relationship?

Thank you!!!