Mostly by his eagerness to jump right into another relationship after his girlfriend ran away. Maybe that should have been my first sign to run as well.
You hit it on the head. This is a real red flag, that should never have been ignored, as is this,
She still doesn't know about me and I don't think it's fair to her. Especially if I'm going to be in this baby's life.
Even you can see the problems with this assumption. You have put yourself so in the middle of their business, you fail to recognize he isn't handling HIS business in a fair honest way.
My advice is stop tripping over what he has to do, now and in the future, and stay away from this situation until its settled. You have allowed yourself to get to involved in 7 months, and I won't call you an idiot, but a female that's so in love she is blinded by facts.
Talaniman Rule - Stay away from people who have just broken up with some one.
Talaniman Rule - Stay away from any one who has an ex still in there lives.
Talaniman Rule - Never give your heart to a stranger, who hasn't proved they deserved it, or know what to do with it
Your misery is just starting, and will get much worse. Just wait until she finds out you do exist. That's when the fireworks start. And after 7 months, you are and will find out more about him than you knew before.
To much, to fast, crash and burn.
The heart you save may be your own, so protect yourself.