When you are "in love", your brain is releasing a cocktail of hormones that make you feel this way. Some of these hormones have effects other than to make you feel all lovey-dovey, and result in physiological changes such as increased heart rate. I'm fairly sure the specific hormone that causes increased blood pressure is adrenalin but I'm not 100% certain off the top of my head
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It means the man is excited by the girl! When you're excited, your heart rate speeds up, you sweat a little, maybe even feel a bit light-headed. It's love (or lust, at least). :)
i do i do i do,i love you whoever you are!
When a guy makes your heart beat out of your chest and thinks your pretty means that you have a crush on them. When I was a child it was called puppy love. It is the point when you are obsessed and can't stop thinking about them.
Your heart rate increases in response to the higher levels of adrenaline that are released when you see or think about someone you love.
Emotions, love, I suspect.