I still love him though

I have been talking to this boy for over 15 months and I will say everything happened fast. After a while I got attached to him and began tolerating and forgiving a lot of his bad character. He apologizes always (repeats the same thing over again) and, for a while now I have known that he is in a relationship with another girl I know, like and respect a lot. I can’t take it anymore and, I’m ready to let go of him. He brings more uncertainty to me than peace, and although he can be nice and kind I don’t feel loved by him, not respected, I don’t admire how he chooses to live his life generally and instead of waiting for him to change and I’m ready to let him go to allow myself be loved by myself and by someone else who sees me as “enough “. Day 1 of letting go of what’s not mine.