Me and my ex tried to be friends and we ended up becoming too friendly, to the point where it became a grey zone. Sometimes we acted like we were still dating, to the point where friends joked about us being back together, but since she has a new bf we were just friends. In my experience if you are not happy being friends then don’t be and go limited or no contact. There is a difference between being friends and being friendly. Being friendly is “Oh he said hi to me in passing, I should be polite and say hi back” while friends is “Oh lets text frequently and hang out outside of class”. To me it sounds like you are doing fine though honestly, as far as what you have said you are not talking too much and have done the work to improve yourself.