Advice

I'm on app2 months. I often run on the same issue. Preview: I'm 29 y.o with a child, European originally, living in Texas. I have never dated American guy. So not familiar how they are in dating culture. On app i would get quite a lot of matches. And the issue is that every time i would match, talk in app with very nice guy, he would compliment me and be very involved in conversation, text first mostly, make plans for a dinner date (sometimes that last weeks). Seemingly very interested person but suddenly our chat would get disappeared. It's hurting me, because why would man there be fake nice and then disappear. Just don't pretend if you not interested. I never bother yo answer someone who I matched but I'm not interested to talk basic "hi, how are you". So l'm more involved with those who put more effort and then they would delete me. Acting this way is always Americans white man 31-39 years old. Younger and older man are more persistent but they are out of my age range. I really just trying to find someone for relationship. Is that a cultural difference or what ?