Has anyone ever went from emotional to emotionless?

I used to be really emotional and with crushes/dating I’d fall quick and hard for a guy and my heart would break when I got rejected, like I’d cry for nights. But I’m 19 now and I notice that I’m just emotionless when it comes to that kind of stuff.. The last guy I liked didn’t seem to be interested and even though I liked him a lot, I just dropped him without a tear or a sigh because I didn’t feel like wasting my time on a guy who isn’t interested.. even though I liked him a lot, I wasn’t upset. It’s like I’m dead inside. And months months back I had a ‘thing’ with a guy but it didn’t work out and he was really sad about it and even though I should’ve been, I wasn’t. As mean as it sounds, I was actually a bit irritated by him being so emotional.. I feel like a monster and like I’m heartless. I should be having emotions when it comes to these stuff but I don’t?