1.That woman just checked you out. 那个美女正在挑逗地看着你呢。
Yes, this helps his self-confidence. But it also tells him that you just saw another woman looking at him and you're not afraid to tell him. It shows that you're confident enough to know that he won't be lured away by another gal。
没错，这样说可以提升他的自信心。而且，你敢于告诉他你看到一个女人正看着他，这也说明你对他信心十足，相信他不会被其他人勾引走。