Why can't I trust him?

Im dating this guy, he’s basically acting so perfect. We have great time together but for some reason I always think that there is someone else or that he’s playing me and all that. If he doesn’t text me back after few hours I just think he’s maybe with someone else and im just getting frustrated. Im so happy with him and that’s when I think that maybe his just pretending to be so good cuz no one can be this good. I don’t know if I have trust issues or if im overthinking or something else. Did anyone had same feelings before with someone that they have been dating?
Why can't I trust him?
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