Is it normal to feel like this?

So I have been in a relationship with my boyfriend for 8 months... And up until this week where I had an emotional breakdown and began questioning everything due to stress... My relationship has been perfect. I have always felt that overwhelming love feeling when I'm around my boyfriend, when I think of him. Now... I'm questioning whether I truly love him becuz I haven't been feeling that overwhelming love feelIng lately. I might at that this is my first serious relationship. I'm scared that becuz I don't feel the overwhelming love feeling that I don't truly love him... But my boyfriend who has been in quite a few relationships before me.. Says its normal and that the first new love feeling doesn't last forever. I feel like deep down I love him, in my heart. But my mind says cuz I don't feel the overwhelming feeling... It's not real. So I'm confused... Is my boyfriend right? Do I just need to transition into that stage where I know I love him but I don't need to feel the overwhelming feeling?