UGHHHHH Why!?!?! Any advice would be nice>!>!?

Ok here is the problem. Almost two years ago I left my ex finally after 11 yrs of hell. I was single for about 6 months and then this really great guy that I had always kind of liked showed up. I was just going to give in to curiosity and do the whole one night stand thing but......I realized how sweet n wonderful he is n well we moved in together in october. It is all still great with him he is still awesome but for some reason I am not happy at all. Between the two of us we have four kids who are great I guess you could say I have the world right now. He is still married to his ex (not by choice she wont do her part n they were seperated for a year before we hooked up) my ex is still messin with me I have freinds which I have fallen out with recently and I have not been able to see my really good freinds as often as I want. Oh n to top it all off I just lost my job sweet huh. So I guess I am feeling a little stir crazy or something. Any advice would be great I have no clue why I cant just let it all go n be happy?!?!?!?!