It is normal to send text messages several times a week.

If a boy sends you messages every day at first, then sends them several times a week, and then calls once a month. Then I think this shows that this boy's feelings for you are getting weaker and weaker, and his freshness for you is getting weaker and weaker. Basically, I have no feelings for you. Another point is that if a boy takes the initiative to you at first, but he doesn't take the initiative to you at last, then he actually wants you to take the initiative, but you don't get the response he wants, so he should slowly give you the cold shoulder.