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?

I'd say don't bring up a guys weight. Heck of he's big than he's got some insecurities. Don't be too forceful or drolly because he manly think its a prank or fat shame. I'd say like anything else talk like a normal person. Ask interests and such. If you start a bit light n go heavy it'll make him feel like one of a kind.

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.