There's a very simple answer to your plight:
as harsh as it may seem, you should most definitely not wait for him!
1. He cheated on you and he could do it again. If there's no trust, then a relationship cannot survive.
2. Think of his promise. He claimed to have married that girl' so that she wouldn't have an abortion. He's planning on leaving her after the baby's born just to be sure? well, he can leave her prior to the birth, if he's only objective is for the baby to be born and besides think of how he's misleading that woman. He can do the same to you.

Your father has just died, and you're vulnerable. Don't make any rash decisions based on loneliness.

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