This will be a short myTake since I don't believe it needs to be strung out more than it should.
I see many questions here from women saying "why can't guys go after just one woman?"
Men have a lower success rate than women
Men in society are supposed to be the ones chasing women. Women tend to have higher standards in the dating world so they choose their partners more carefully. In order for a man to be successful, it's crucial he talks to as many girls as possible so his chances of success are higher.
Women can be flaky and suspicious of men, so if a man does not want to waste time chasing a girl who could be using him for attention, it's a good idea to have backup girls to go after.
Can you really blame men for wanting to make their odds better? A good analogy to this would be if you're a fisherman, and you needed to catch a specific fish, would you throw up only one net, or 10 nets?
Women should not take this so personally and accept this. My advice to any woman who finds a man she likes: Stop playing mind games and let him know you're interested. If you act hot and cold, there's a high chance he's going to text that other girl.