Advice please? Hard to find someone...

I'm a really chill person so I easily become friends with anyone (of course I dont deal with toxicity lol) but I've been noticing a pattern with my love life. Recently, when I message guys, it starts off with just being friends but then seeming like it could possibly go further. We continue to flirt but after a few -weeks I would say- I would stop getting messages for a while and then it would go back to messaging as friends as if the flirting never happened. Its been happening a few times and it's getting annoying and a bit depressing haha. I look back at the messages but I dont see where things could've gone wrong. I don't understand why and would love some advice.

Thank you!