How does being in love with someone feel like once the initial stage has passed (no butterflies etc.)?

I mean I know what having a crush feels like. I love the part where I anticipate seeing him, his smile, if by chance we share any convos, i replay it in my head over and over again and it makes me happy like for months

But once that's over, it feels empty. Even if I like the person, and they are the sweetest and we are compatible share same values and so on,
I can be committed but what I don't feel is that romantic love.

The excitement, the first stage. Yet some girls say they still feel it after 10 years of being with someone. Is that realistic?
or are they talking about once every now and then when moments pop up where you feel grateful to have that person in your life?
Whereas with stage one, that feeling is everyday.
How does being in love with someone feel like once the initial stage has passed (no butterflies etc.)?
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