without sounding like I'm entirely trying to disagree with everyone here about their opinions I do see something that I'm not sure has been mentioned here.

You've been with this person 5 yrs. the tone of your descriptions sound a lot like you're defending who he is which is a good thing, it sounds like you do indeed have a lot of respect for him and caring. The question I wonder if you've asked yourself is this - if after 5 yrs and break ups of a day or so, what is it that keeps you coming back? nothing is keeping you in the relationship but you. So not to sound negative but although you say you have reservations, are they really reservations or cold feet? Because as you've described him I do not get the impression that you're manipulated to stay with this person, you sound smart and strong enough to make the judgment yourself, he does not sound abusive or anything esp not to the point you feel trapped, so you have over course of 5 yrs chosen to remain with this guy. That is something I am not sure you're considering.

Here's the other thing I've noticed, in your description, NOTHING in what you've said carries the weight that it seems you place on it n your mind. So he's socially awkward - ok, that could be hard at times but you obviously know why or have an idea why and you actually go out of your way to say this here. You know how autism and ocd or tourettes can affect someone and you don't sound like it bothers you personally - except in social situations and frankly that's not important. how others perceive your partner means squat, you're the one with them not them and image is an elusive object. actual contentment and joy in a relationship is far more important than how the couple looks to outsiders.

So lastly, emotional love is a part of things but I'll be honest, it comes and goes. that he "loves me deeply" and that you don't feel you do is meaningless. because in time even if you committed now, and married, will change and comes and goes. Please, please please do not make any decision on staying or going based on emotion. That he's committed, and clearly caring and other things is more important when deciding on someone to be with for life because frankly, again, feelings will change but values and integrity and commitment are the things that need to be consistent and they last.