How do I know if I’m in love with someone?

I‘ve got two American pen pals and I’m holding off on sex and relationships until I meet them both and hopefully one of them and I will fall in love. Eventually and get married a few years later. I know I feel the desire for marriage and children as a dull ache at the back of my mind. But I want it to be with the right person. I have mild Autism and I’m wondering, how will I know if I’ve fallen in love? I haven’t had many serious relationships.

How do I know if I’m in love with someone?
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