woman possibly pregnant, dad has doubts

You know the pitfalls now. I'd say sit down and really talk things through calmly, without arguing. Don't blame each other, and admit your own mistakes too. Maybe couple's therapy could help? Communication is the most important thing, along with understanding! Believe me, those hormones really do cause mood swings. It's hard for men to imagine sometimes, but look into it and don't react too harshly. That doesn't really help. I know!

I can only tell you that abortion will also cause a lot of stress. Especially in an already tense situation. Most people (and from my experience, both women and men) underestimate what it does to you. Not just emotionally, but also physically.

Pfff... what a difficult story. You're touching on two different subjects here: your relationship and the pregnancy. It seems to me that you're not equals in your relationship. So, baby or not... that needs to be resolved... and you need to do it together. A baby isn't a solution for either of you for a relationship or happiness. I don't judge abortion. I would just say that it's not up to the man to decide on that. So talk to her first about your relationship and what your concerns are regarding your relationship (so not necessarily the pregnancy, but rather what her behavior sometimes means to you and how you experienced everything four years ago). Maybe it will bring you closer together if you can express your concerns. From there, you can look further.