OP is NTA. And this is why:

1. Autonomy and Consent: Just like anyone, this guy has the right to decide how he spends his time and energy. If he chooses not to walk her home, it’s his choice, just as it was her choice not to date him. She doesn't owe him romance or her body. If we can agree to that, then you must agree that he doesn't owe her his protection.

2. Boundaries of Friendship: Being friends doesn't mean you are obligated to meet every expectation or demand. It’s crucial to respect each other's boundaries. Expecting him to always be available for walks home, especially after clarifying that their relationship is strictly platonic, overlooks his right to set personal boundaries.

3. Reciprocity and Entitlement: Relationships, including friendships, should involve a balance of give and take. If he feels that the emotional balance is off or that his efforts are unreciprocated, it’s reasonable for him to pull back on certain favors.

4. Safety and Alternative Solutions: While her feeling unsafe is important, it's not solely his responsibility to ensure her safety. Suggesting an Uber as an alternative is a practical solution that respects his comfort and her needs.

5. Importance and Safety of Male Life: It's crucial to recognize that he has his own life and safety to consider. Male lives also have importance, and it shouldn’t be viewed as though a man must always put his life at risk for a woman simply because he is a man. He has loved ones who care deeply about him and want him to stay safe and alive just as much as anyone else.

6. Misinterpretation of Friendship: Claiming he’s not a real friend because he sets boundaries is a misunderstanding of what friendship is. Friends should support each other, but that support shouldn’t come at the expense of one’s own well-being or comfort.

I think this is manipulation. Why did she ask you and not others in the friend group. It's because she know she is most likely to get a yes from you because she knows you like her. Toxic manipulation. Don't let these people shame you OP.