When do you know that it's real—the chemistry, the love with a person? When do you know that it's really love this time?

I asked this question to my friend when I was 15 with zero clue: Why do people break up in a relationship when they say they love each other? He just smiled at me and said, 'You'll know it'. We all at some point get attracted to someone, and things just happen. At first, you think that you've found your person, but eventually you realise this ain't it. I mean, how and when do you know that sh*t is real? The love I have for someone is real. This is the right one for me. What are the signs of it?

When do you know that it's real—the chemistry, the love with a person? When do you know that it's really love this time?
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