Incapable of feeling romantic emotions for more than a few months.

So my bf just broke up with me. When he said it honestly I didn’t really feel anything, just gave him a thumbs up and went back to my work. Okay maybe I did feel something...I know that it sounds cruel but maybe I was a bit relived?Our personalities and interests all matched really well, it’s just, after the first 5months of being together I stopped really feeling anything romantically towards him. We’ve been together 3 years now and most days feel like an uphill battle. He has mental health issues and I feel like overtime I’ve turned into more of a mother figure than a significant other, and I’m so tired, maybe that’s why I didn’t really feel much when he suggested breaking up? Anyways I’m just a bit confused, was I actually in love to start with or was it lust? Maybe I just couldn’t bring myself to feel things romantically really cuz I was always too busy caring for him. I’m hoping that it was that. My previous relationship fizzled out similarly and I wasn’t a carer in that scenario so I’m a bit scared that I’m incapable of actually loving someone as more than a family member or a friend(which I still consider my, I guess, recent ex to be).