This is hard, I know. But it sounds like you really know the answer to this.
Ask yourself:
Are you getting all the love, respect, admiration, support, friendship, and all that comes with being with someone who is supposed to love you, from this relationship?
Does he look at you as someone he puts first in the relationship? Do you look at him that way? Are the two of growing together or moving apart?
Do you need him? Or want him.
Do you feel like you both support each others dreams and goals and see yourselves together for a very long time?
If you don't feel any of these, then why would either of you want to pro-long this?
I feel like I say this too much in other posts, but don't you deserve the kind of relationship that gives you love and respect and support? We all do.
And by the way, your REAL true-blue friends will encourage you to live your best life and support you. If anyone else whines about it, tell them to leave it alone.This is your life.
Good luck!