General

I'm not really sure what advice to give but I know from my own experience, I tend to miss the clues a girl is interested till later, after the encounter. I also have a problem trusting that her interest is genuine. I tend to assume she's just being manipulative or just wants money or something. I don't trust myself to know who's real and who's just playing a game. So what could a girl do to show me she's genuinely interested... I actually don't know. That's probably something I need to work on too, but how?

The desire for additional dated can be clearly conveyed by saying you had a good time and would like to see him again. Physical attraction can be conveyed by words - complementing his eyes, contact - brushing his hand with yours, leaning in and sticking out your lips for a kiss, etc.