How do you keep a guy interested?

It seems that with dating sites and social media being so prevalent, finding someone has become even harder. It's so easy to "meet" lots of people, and talk to them all at the same time. Everyone seems to think that the next one that comes along is going to be better than the 10 they're already talking to. How do you keep someone interested when you're one of many? My title asks about keeping a guy interested, but I'm sure girls probably do the same thing.
How do you keep a guy interested?
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