What do you do when someone starts to withdraw and show less interest?

If a person starts withdrawing and showing less interest in you, do you slightly stop talking to them or talk to them about it? But if they refuse to explain themselves, do you then tell them to go your separate ways?
For someone like me, I don't like it when people play that game of no contact when the other person is texting less and less. I would rather communicate with them and ask whether something is wrong. But if they refuse to explain their behavior, I then cut contact right then and there.
What do you do when someone starts to withdraw and show less interest?
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