Failing at dating

I recently met a guy who I really liked and was super excited about. We actually met a long time ago on Grindr and texted for a bit on and off, until last week I suggested that we meet up at university for a coffee.Now I know people will think that because we met on Grindr that he was just looking for sex. But actually he turned out to be an awesome guy. The first date went really well, at least I thought so. He even kissed me at the end!But then a week later when I tried to arrange that we meet again, he seemed rather uninterested and I was getting mixed signals. He was always "busy". I actually asked if he's still interested to which he didn't reply. And now I'm really sad because I was so excited about this guy. I really thought he was great, nothing like any of the other guys I had met before :(I just don't get why guys do this. Why do they lead me on, get me all excited at the first meeting and then just go cold after that? He's one of several guys who have done exactly that. I've thought a lot about what I am doing wrong, but I just don't know. I believe I'm rather attractive and easy-going, and I feel I've become a lot better at socialising with people.I've lost all hope. It's really hard for me to put myself out there and meet people and now I'm so scared of getting hurt again. Every time this happens I go into a state of depression for weeks.TL;DRHaving a hard time with dating. Guys show interest at the start but afterwards I get mixed feelings. It's really upsetting. Starting to lose hope.