support

Husband cheated on me 4 months after having our first son, we reconciled our relationships months later now I'm pregnant (34 weeks) with boy #2 , husband decides this isn't the life he wants to live . I found out he's been talking to the same woman he had cheated on me with before. I don't know what to do I'm so lost I feel like a puppet I would do anything for him, we still live under the same roof for the sake of our son but  my husband comes and goes as he pleases. I just need some one to talk to that maybe went through something similar. Is there light at the end of this awful dark tunnel?