Around 1 year ago, there was a girl in my tutorial group at university. She tried to be friendly towards me and I was standoffish back towards her on one occasion. I am so so ashamed of the way I treated her. I feel guilty about it everyday. The reason I did it (and I know it is no excuse) was because have been hurt a lot by people and treated badly by a lot of people and I had some mental health problems at the time. I know what I did was awful. I really wanted to message her on LinkedIn (I don't have any social media) and apologize for how rude I was to her. I do not expect any reply back. I just want her to know how sorry I am.
Should I contact her to apologize?