He cheated and had two kids on me

My husband and I have 3 children & one on the way . I’m a stay at home mom and I just found out he’s been having an affair and has brought two children into this world with the other woman. I’m so hurt and what makes it worse is we solely rely on him financially. I have family I can go to but I don’t want to feel like I’m dumping my problems on them and crowding their homes with my children and myself.