why am I so messed up

Jade
So I split with my ex husband last year we get on we'll regarding the kids. I ended the relationship badly. 
Anyway he is kinda seeing someone. I am with someone and expecting his baby: this relationship has had it's bad bits and good bits. When first got together he was always breaking stuff pulling handbreak up on car etc and being intimidating 
Now he is lovely always saying he loves me etc but hormones or not I am always crying I miss my old life I miss my ex yes it's awful I know. I can't tell my partner how I feel and can't tell my ex. 
I always feel guilty for my three kids from my ex about splitting their family up
I'm so lost. I'm struggling working massively I work nights and all I do is dread it and cry
And my moods are being taken out on my partner I can't give him the love he is craving