Most Helpful Guy
It's an instant connection, an intense chemistry with someone, it's usually really intense, it can feel like a burning sensation in your chest (my own experience). However this spark never lasts and usually fizzles out as quickly as it develops and no good, long-term relationship comes from such an intense beginning.
Relationships where the spark develops over a course of time are much better from my experience.
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Most Helpful Girl
I think even friends can have a spark, though without sexual attraction in that case. It's when relating to each other is easy because you seem to be on the same wavelength. You enjoy their company without it seeming like effort.