Oh boy! I feel your pain Melissa.
My family (well more of my husbands family) is questionable like your exs family. My husbands brother had a son when he was 17, with a 16 y/o gal. The day my husbands nephew was born, everyone was excited. After 6 years (that would be 2008), the dad (my bro in law) doesnt want to be apart of his owns sons life. How can someone be loving his son, share custody with the mom, spend time with him TO not wanting him anymore?? Why after 6 years of being a dad TO letting him go?? He even offered my husband his custody half to my husband so that the welfare doesn't extract money from his paychecks. But the shiethead decided to jump from job to job so the government wont catch him.
B/c of that, my husband and I have took the little boy into our home. We have him everyother weekend so he gets to spend more time with his dad's family. The little boy speaks so highly of his dad ("my dad is so fun, I miss him", etc.), but he doesn't yet realize what his dad has done to him (my husband is more of a father to him, even the mom admitted that).
And I can pick out so many other people in my husbands and I family who have a similar situation as you Mel.
For your ex to screw around with a 14 y/o is INSANE!
Just the thought of it... your ex seriously has problems. Maybe he has more secrets that no one knows about. Maybe it's a good thing that your son shouldn't "really" know him. I know many single mothers who have wonderful children. My best friend (Joey, he is 22 now), was raised by a single mom who was a gang banger back in her days. She had him at a young age, and Joey never sees or speaks to his dad. But Joey is a great guy. He never disrespects women, he loves kids, he loves his family, his always there when you need someone, etc. If your son is raised with or without a father figure, I think he will be okay (you'll just have to be mom & dad).
And about Dave, maybe he really wants to be apart of your sons life. Give him a chance, but yet again, watch your back. Sometimes people play games to later incriminate. But I would think there's nothing criminal that you have done. Your being a mom and your taking care of your responsibilities.
And my belief, abortion is a no-no (well, unless rape or illness is an issue).
Yeah, and I suggest you should actually talk (not text) Dave (it will show his and your seriousness about this situation). Your son is a serious issue. And for a man to walk out on his own kid shows how unhuman & unresponsible he is. He has a mind of a child.
Later in life, you will find a great man who would love to be a father to your son and a lovely, supportive hubby/bf to you. Everyone has their lowest points of their lives, and it's always supported with the highest points. It will balance out eventually, just like your ex getting karma (like jail time!).