Could someone please give me some advice? [18, female]

My ex and I have been trying to reconnect for the past two months. We've had our ups and downs, but we are at least talking. I love him deeply, but he's not the same person he used to be; he doesn't seem to care about me at all anymore. He was once so gentle, kind, and loving, but none of that is evident now. I'm really unsure about what to do because I don't want to end things—I know I would regret it, and I can't help but wonder if we could eventually make it work. I really need advice and someone who can relate to what I'm going through because I'm feeling so lost and hurt, and I just don’t know what to think anymore.