I am 26 yo, 5'8 and live in Germany. People often tell me that I look good nowadays. Girls are interested in kissing or fucking me. But actually, I'm interested in more than that.. I want a long term relationship.

I am very suprised how many girls seem to not be interested in that anymore. Even though they are clearly attracted to me when we meet, they do not seem to be interested in staying in contact. It is all very short term. Even if they say "I want a relationship" and they say "Oh my God we have so much in common" blablabla on one day, they end up ending it on the next day.

My question is: What do you think are my fundamental issues here that could lead to girls losing their interest? How do I keep the girls interested?

Maybe the issue is in my character and my behaviour, but I do not know what it is. I do not believe I act too interested/needy and I do not believe I am myself not interesting, funny enough..