Perfect Tense Stative verbs

Question

I'd like you to tell me which one of my following sentences is correct. I am not sure if I have to use the past simple or present perfect.

I'd add that I want to talk about something which is still true. I'm still in love with the person I talk to!

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1. I've loved you as soon as I saw you

   Or

2. I loved you as soon as I saw you

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3. I've loved you from the first day

   Or

4. I loved you from the first day

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I need you to tell me, but I think present perfect must be correct since we say :

I've loved her since I met her

Thank you very much

Answer 1

Since you are talking about something which is still true, you need to use present perfect:

We use the present perfect:

• for something that started in the past and continues in the present:

They've been married for nearly fifty years.

She has lived in Liverpool all her life.

<...>

(https://learnenglish.britishcouncil.org/english-grammar-reference/present-perfect)

Now let's return to your question. Sentences 2 and 4 are not what we need because we are talking about something which is still true, as we said (i.e. "I loved you" means "I loved you in the past, but now I don't"). Sentences 1 and 3 are perfectly fine.

Please note that present perfect can also be used in other situations. You can follow the link to the British Council site (or, perhaps, this link - https://www.englishpage.com/verbpage/presentperfect.html) for more details. Hope that helps!