The only good advice here is from the most recent post! Just skip all the rest, I don't know what those people are thinking...
I agree with adam_k : tell the guy you like that you are interested in something serious. If he's not interested, then you don't need that guy!
I think there's a lot of bs on the internet and out in the world, ideas about how women should behave that have little to do with what women want or finding a good person to spend time with. The only way you're gonna know that someone is interested in you for a committed relationship is if you ask them. You could ask on the first date: if they're just looking for somebody dtf, then you don't have to waste your time.