“You can come if you want to”
You “know” that if the guy is just exposed to you enough, he’ll fall for you. So you’re taking any chance you can to hang out with him. Even when his invite consists of the words, “You can come…if you want.” A guy that truly wants you there will say, “I’d LOVE for you to come.” A man that says it the former way has no intention of paying attention to you at the party/bar/beach/whatever. A man that wants you there lets you know that you will enhance the experience for him. That you would be doing him the favor by attending with him. But if he says, “You can come if you want…” he felt obligated to invite you and you’ll only look desperate for going. It’s a lose, lose.