You know....i always say regret is actually the worst feeling in the world...because there is really nothing you can do to change the past. I have this feeling that you think a separation would be a failure on your part. Life is too short to be unhappy...life is too short to be treated badly. I think you should sit him down and say "this isn't working for me, i need someone who is supportive and caring, who can be nice to me especially when i am having a bad day, and that's really not asking too much". I would ask that he attend couples counseling with you if he wants to work on the relationship....and if he doesn't....then in my opinon...he has no desire to change and/or doesnt feel like the relationship is worth the effort. I would just hate to see you waste 5-10-15 years of your life with someone who makes you feel terrible...separation sucks...but someone has to do whats best for you...someone has to look out for you...and it should be you.