S.J.
Trapping him his definintely not a good idea. Just because you have children together doesn't mean he has to stay around. You said it yourself, you're a single stressed out mother. If you have another baby it'll just be worse, especially if he leaves, that's assuming you have some sort of relationship right now. I would definitely talk to him about it. Why do you feel you need to trap him anyway? Do you have doubts about your relationship?