Is it ok to still like my ex after they said some rude things because they listened to their friends about what rude things to say to me? Even if they apologized weeks later?

Your feelings are always valid and it is always ok to feel however you are feeling. Breakups are messy and it's very normal to be unsure of how you are supposed to feel during them. They clearly said hurtful things to you, but that doesn't make them a bad person and I am sure you had a lot of great times together too. It is nice that they recognized that what they said was wrong and apologized for it, but that doesn't mean you are obligated to forgive them and forget about it. If you are upset, that's ok. If you are just heartbroken and miss them, that's ok too.