Eddie's right.

I know you feel the instinctive urge to reply, save face, snap back a little or whatever else. But really, the most effective way for your own self development of handling these things is simply not replying. Firstly because there's literally no point.

Why would you? There are only two outcomes:
1. You reassure her of her decision being the correct one. Her actions phased you, you reacted to that and now she knows it was the right call. 95% of the times this is exactly what happens.

2. She somehow feels bad about ignoring you? maybe she changes her mind and agrees to go out once more out of her own personal weakness and as a means of avoiding confrontation?
Even if this were to ever happen, do you really wanna be that person? Scrap dog waiting by the table, hoping some food falls off?

Nah dude, you don't want that. Don't reply. That's doing right by you and I guarantee, as a little extra bonus she will spend an arbitrary amount of time wondering why she doesn't have a hold on you anymore.

I can vouch for Eddie's link, he explains it better than I can.

In any case, next time escalate better. Why on Earth would you take 4 dates for something so insignificant? It's just a kiss. What's the worst that can happen? She runs away in terror?
That'll make a great story over a couple of beers two weeks later.

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