Speak up, or you will lose me. I can't spend my whole life waiting for you. Life isn't about losing something you love, its about taking a chance for something you want, taking a leap of faith. If you really wanted me, you would say something.
This line really speaks to me. It's saying how they really want it to work, but the other person isn't trying that much. It reminds me when you've been texting someone for a long time, but you're always the first person to say something. Then there's that one day you don't text first and the person doesn't text you at all so you see how many days you can go without them texting you. Before you know it, it's been a week and they've already moved on to another girl. It's a stomach-dropping feeling and I think that's the feeling they're trying to make the listener experience with this line. A feeling of lost hope and surrendering.