is irrationality always bad ? i need help !

[Ace Otana]

I'm not just talking about sexual attraction. That is an absurd conclusion. Do you only Love those you are sexually attracted to? I love dogs, and motorcycles and many things/ people I am not in the least sexually attracted to. Love can easily be spiritual, although it cannot be quantified, therefore is too easily dismissed. I have several 'Jessicas' in my life. I love them still, despite letting them go. I think science is only too quick to dismiss Love as having any real meaning beyond chemical reaction.
My God is Love. Its reality can be measured by its effects. They are all around you, and easy to see if you can get your head out of your own desires.

I'm not just talking about sexual attraction.

Nor was I.

I think science is only too quick to dismiss Love as having any real meaning beyond chemical reaction.

Science concludes based on available evidence. It doesn't do belief, superstition. Religion does that.

They are all around you, and easy to see if you can get your head out of your own desires

It's not my "personal desires" to believe in a scientific conclusion. I think you are opting for a more satisfying answer than a more scientific and realistic one. I don't believe in things because I want them to be true. I want the truth even if I don't like it. It's because I want to know the real truth and not my own delusional version of it.
Love is just a chemical reaction. Might sound a bit sad and disappointing to conclude but reality isn't about what we want reality to be but what it is.

I have several 'Jessicas' in my life.

Several? Jeese, I only had one and she's trouble. She went off and had sex with someone else and had his child. Now she's a single mum and thought I'd be happy to jump back in and play the role of "daddy".

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"Since the lust and attraction stages are both considered temporary, a third stage is needed to account for long-term relationships. Attachment is the bonding that promotes relationships lasting for many years and even decades. Attachment is generally based on commitments such as marriage and children, or on mutual friendship based on things like shared interests. It has been linked to higher levels of the chemicals oxytocin and vasopressin to a greater degree than short-term relationships have.[10] Enzo Emanuele and coworkers reported the protein molecule known as the nerve growth factor (NGF) has high levels when people first fall in love, but these return to previous levels after one year."

I've been doing my homework.

Love is chemical.
Saying god is the reason or it's some spiritual reason doesn't give us a greater understanding of it. No details to how it works. God is a useless answer. Because it doesn't get us anywhere.
Let's say for argument sake that you were right and that all those chemicals that have been reacting that has been tested, measured, repeated and confirmed and that it really is all spiritual. Were does that leave us? How does that boost our knowledge of understanding of it? How does that help us in anyway? How does saying "it's spiritual" give us any greater understanding of it? How can we gather knowledge from that conclusion? What use is it to us to conclude that it's spiritual?