Hi! Have never done that before, but things got really awful, and I trully need an advice. I am (actually was) with a guy, 10 yrs older than me, for 3,5 years. He is divorced with two kinds (that adore me and I do too!) We were planning to live together, and have a family on our own, when he suddenly said he is not having a good time with me, and he wants off. I tried to convince him (with all means) but no! He was certain for his decision. I went home, I picked up all my remaining belongings (clothes etc), left him his keys, and left!
The sad thing in the story is that we work together, thus meaning I see him every day in the office (rough!).
After on month apart, he appears every night in the form of sms in my mobile, how sad he is, what a mess he made his life and stuff like that. Although I was certain that everything was off, suddenly I am not that sure.
On the other hand, of course, he blames me for everything (whatever went wrong was my own fault-while he was perfect!). To his friends he says that he is the one to blame.
My problem :
I love him. I adore him but he drives me crazy. Instead of steeking to his decision (that cost the hell a lot) he starts coming around but with nothing specific! Once I replied to his sms, that I do miss you (and that was all) and he started accussing me that I am doing nothing for that relationship!! Instead of doing something for us, he accusses me!
What can I do? I do not want to go back (actually not been asked) to the same situation, but I do love him!
Thank you.

You already have the answer in your heart because you have said it in the last line. So, I will just validate it for you: Do not go back.
It is already hard enough that you have to see him at work. This makes it harder to have a clean break and move on. Even though you love him and you have invested a lot of time with him, you don't sound like you were happy with him. If you couldn't resolve your issues within the 3-5 years you were together and it came to a point where he decided to end it, there is no point in going back.
Try to cut off contact with him. Let him know that you don't want to be dragged through a messy situation anymore. Good luck.