Please I need someone that has gone through this😞 I feel used rn

we had been together for a month and he started as the perfect gentleman. He met my family and I met his, he wanted to go out with me all the time, and do everything he needed to do to be next to me. I lost my virginity to him, because I honestly thought he was finally the guy I deserved, After that he was perfect, he seemed like he had touched the skies after we slept together. a week after he started changing, he didn't want to come to my house anymore, (he has money issues) so I understood that. But he had gas to go to the gym with his cousin, literally 4 blocks away from my house and he wouldn't pass by, like he used to do. other days he would wake up at 3 PM and wouldn't come to see me. He even told me it was a waste of resources to come to my house since we couldn't do anything there and it was only for an hour since he had to go to sleep. we would spent 4 days without it seeing each other just because he didn't feel like coming to my house which never happened when we started dating. after that we haven't had sex in 3 weeks which leads me to think he has someone, maybe his ex wanted to come back. This past 3 weeks he has completely changed, he doesn't look at me the way he used to, we don't even have the sex drive anymore (and I've tried). 4 days ago I texted him and he replied 2 days ago asking me if I was still alive. I never replied back. what I don't understand is how did he go from the perfect guy to this piece of ****. I'm so disappointed because I gave my virginity to him and now he's nothing like the guy I knew. has enyone gone through this? please I feel dumb for falling for this.