Your love is not eternal. Not when someone treats you like they have. At some point you will meet someone who shows you what real love is and what real respect is.
Getting out of the house is a must. I went running every day (actually it may have been a fast walk) but it was 40 mins that got me fresh air. do you have a friend with a dog (meet up and take the dog for a walk).
A separation/divorce is like a death and there are stages to go through.
Denial
Anger
Bargaining
Depression
Acceptance
It is normal to flick through and some people stay in one stage longer than others.
Sounds like you are in the bargaining (you will do anything to have him back) and depression (tears and sadness).
It can be difficult to get to acceptance and once there you may still look back every now and then and think how would life have been if you had stayed together. But i know in my case all i would have been doing is postponing the unavoidable.
My mum died a couple of years before i separated. She had three months notice (terminal cancer). For two of those months my dad and i were in the denial phase. If i could turn the clock back i would have made better use of those first two months.
Now crying is OK. I'll admit i have cried during the early stages of separation but what deep down are you are crying about?
is it the fact marriage is over (denial/anger or depression phase) OR can you maybe cry because you married the wrong person (they did not turn out to be the person you thought they were - Acceptance phase)
There is not a magic pill to make this all better. talking with friends helps. What about rearranging stuff in the house (put TV in different corner/move furniture), sort cupboards out and get rid of things you don't need. Put a picture of mantelpiece of you looking stunning (not with ex in it!!).
Keep going.