He's never home.. Help

Katherine
I have young kids and been dating a wonderful man for a while, he's now been living with us the last few months.
I get frustrated because he never comes homes in the evenings.
Its usually around 9 that he'll walk in. I have no idea what he does, talks with budies, fishes, just random stuff.
And it upsets me. 
I feel guilty that I'm upset and don't know how to justify it.
He does make a point to spend a day out of the week with me and the kids. Which is nice.
I suppose I expected him to be home for dinner or watch tv with in the evenings.
I can't ever go out with him because I have the kids (their father lives far away and cant help :( )
He'll leave for the day and I have no odea when I'll see him again.
He'll say im hanging with the boys and random stuff happens and before I know it, its 12am.
I hate how nothing is planned. And that he's already never home.
I feel bad because I resent that he can go out and just leaves me, with no thought of me in the kids.
I know I'm wrong.
I'm scared I expect to much.
I don't know. Needed to vent. 

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