It sounds like the responsibilities for this relationship are unbalanced, and becoming more unbalanced as it progresses.
I usually suggest someone go with their gut when it comes to relationships, as relying on emotions is not rational.
You are looking at having to pay for daycare for a child that is not yours, and you haven't yet been reimbursed from before.
You don't want to be alone anymore?
When someone wants to stay in a miserable situation because they dont' want to be alone, I really want to come over there & shake you & say "snap out of it."
as harsh as it may sound.....
"My son does not know about the drinking and driving - it is none of his business"