I do not think the text is counting times, but describing an attitude whih is not serious. If you go into something or believe in something like something you do today and tomorrow you change your mind and then change again and then you mood is different and change again, etc. etc., that is not serious. Think you do that with a person you love and intend to marry. Yu cannot do that, not because God, gets angry or because your beloved get angry, but because you are not trustable, you are ot faithful and you feel that changing on a serious undertaking is nothing.
Salaam