Sobriety and Dating

So me and this guy have been going out for a bit. We didn’t have a label or anything but he called me his girlfriend a few times even though we never had that conversation. He’s been acting distant recently and he told me today that he’s been relapsing. I knew he was an addict. And I knew he was hooked on a lot of things, and I mean a lot - heroin, coke, opioids, benzos, and fentanyl. He was sober when we met. I really like him and I don’t judge people on their addictions. But he told me that he can’t handle being in a relationship right now because of how much he’s struggling to stay clean. I want nothing more than for him to be safe and healthy, so I understand where he’s coming from. I just feel guilty about being upset. Of course I wouldn’t express being sad to him because it’s for his own good, but it hurts so badly. I really wanted to be with him and I feel so selfish for being upset about it.