Someone can care about you and still be incapable of caring for you correctly.

Genuine affection and the ability to treat someone well are separate capacities. A person can love you sincerely and still lack the steadiness, self-awareness, or capacity to show it in ways that are good for you, often because of things that predate you entirely. This is one of the harder facts about relationships, because it means love is not always sufficient. It also means their limitation is not a measure of your worth.

Notice whether the difficulty is about their feelings or their capacity, because you cannot fix the second with more of the first. Decide what you need rather than what they intend. You can believe someone loves you and still need something they cannot give.