Feel confused 😢

Ya Shuan
So there's a guy on Facebook came to me n asked me if I could be his gf. After some days considering, I hung out with him and also had sex couple times. But I'm not sure why I just feel that he becomes less passionate to this relationship whenever we said bye and texted afterwards:( I have be been thinking" Okay...maybe he's just not that into me, and it's the high time I should move on and seek some some who will treat y with adoring eyes lol" Anyway, I've been feeling quite confused and kinda unhappy when I think of this about him😔 
Dear gals...any opinions about it? I'm already really greatful when y guys r willing to Read thro this long post ☺️😚❤️💜