are these common experiences meeting men at bars/clubs?

Hi there,

I (f24) moved to Berlin a few months ago. While I love the city, I have found myself getting flaked on/stood up more than I have ever experienced before. for example, I met a guy at a club and we hung out until the club closed dancing and talking. we were both rather sober and it felt like we connected. before we left the club he asked if I wanted to hang out the next day and go sightseeing and gave me his Instagram. I texted him but then he never followed through. 

I had another situation with a guy I also met at a club. we went on three dates, clicked really well, made each other laugh etc., and then he suddenly pulled away with no explanation.

these situations have made me feel a bit lonely and less trusting of people. i grew up in a smaller city, so maybe i just have to thicken my skin. but back home, even if I met someone in a party setting I could pretty much count on them following through if we talked about meeting again. 

I have tried to meet men in other places besides bars/clubs, but these been the easiest settings to approach people in. Maybe its because I'm on the shyer side as well.

could these situations be happening because of the setting? where else are good places to meet men Berlin?