Why did this guy go from interested to irritated?

Anonymous
I guy that I was seeing and who at that time showed a LOT of interest, started being/ showing general irritation short after I started showing interest back, what could the reason be?

This has happens to me before, where everything is going well and then, when I start showing affection back they start showing small irritation on things i say as if they regret the situation and want to me like them less again?
Why did this guy go from interested to irritated?
2 Opinion