Being in love with a long time friend?

We’ve been good friends for 8 years and recently became a couple. I find myself thinking about him a lot when we are not together. I might be falling too hard for him and I’m scared. I’ve asked him before “what if we fall out of love?” and he said “If that ever happens, we will stay best of friends.”

But can a former couple really be best friends?
Being in love with a long time friend?
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