Sending instant messages by WhatsApp is the most common and important way in which a couple stays connected, in fact when you start to get through with a person the messages are an important part of the ritual of conquest.
First of all if the man does not have the gesture to speak directly with you about stopping what he was supposed to paint for a good relationship, it is because of cowardice and for other powerful reasons that we share below:
Most likely, he is only playing with you because he already has a partner, sometimes men who in his courage conquer other girls just for fun, but when they are threatened, the girlfriend or wife will discover them. things bluntly and rudely. They block you without any explanation.
Some men block you because you have fallen in love for a period of time, but it turns out that it is not what you were looking for, probably you just wanted to sleep with you, but when you see that you have not succeeded, you became desperate and blocked you to continue with the next girl that I want to sleep with him (Raw reality, but there are, there are)
He blocked you because he discovered that when you go out with him, you spend it talking about your ex, this happens every day that goes out, this has fed him up and he has realized that you have not forgotten your ex and that there is probably still love between you two.