I think he's going to miss out on the opportunity to date her if he doesn't hurry.
If you miss out on something that would be enjoyable or useful to you, you are not involved in it or do not take part in it. We're missing out on a tremendous opportunity Well, I'm glad you could make it. I didn't want you to miss out. = lose out
If you miss out something or someone, you fail to include them. There should be an apostrophe here, and look, you've missed out the word `men' altogether! What about Sally? You've missed her out. = leave out