Also the idea that love can be a noun only really comes from the distortion of the idea that love is a feeling. If love is a feeling then yes it’s a noun. But it’s not a feeling. It’s a disposition to act, so properly speaking a verb “to love” in its infinitive form. I love you, is a complete sentence, with a subject object and verb. What the sentence “I love you” expresses is the disposition to act even if that disposition is not being acted upon at that very moment.
Now virtue can be used as a noun but that is because we tend to express virtues as being “possessed” rather than what they actually are which is practiced. Honesty is treated as a noun but when we say someone is honest, what we mean is that when they communicate they do not attempt to deceive or rather that they attempt to communicate truely. The same again for if we call someone courageous. We say they have courage, but we don’t mean they possess a certain thing that is courageous, we mean that faced with situations of danger and fear they are able to master their fear and continue to act as they ought rather than act in fear.
When people talk of love as a feeling mostly what they mean is that love is passion. But it is not, it is possible for love to persist beyond passion. They may also mean love is excitement, or contentment or any one of a number of feelings, but what this fails to account for is that it is possible to love someone even if you have no feelings. Even if you resent them, or if you are feeling trapped.
A spouse who cares for their sick and dying spouse may feel disgusted by their lack of bodily control, and may feel repulsed by the smell or by any one of a number of sensations, but still love the person they care for. It is possible to love someone even when you feel nothing good towards them.
What this also means is that love fundamentally begins as a decision, rather than a feeling. This also means that marriage vows make more sense- you are deciding, in effect, to love someone forever- to decide to habitually desire their good until death do you part.