Is this a sign to cut ties with my brother for good?

Him and I have had a very rocky relationship since he got married... his wife and I, along with the rest of my siblings, have had a lot of back and forth with her. Despite that, he's always asking me for stuff for him and the kids... but no, we don't hang out. Anyways, yesterday he reminded me his daughter's bday is on Tuesday and we agreed that Sunday we'd take her out shopping to find stuff that's her size... he bailed without reason. When asked he just told my mom he wouldn't go out to bring my niece. I had already bought her some stuff that I have with me and wanted to buy her more but now I feel like not giving her anything and just cutting contact with him for good because I feel played.
Is this a sign to cut ties with my brother for good?
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