You are both really young... Work on growing and learning. You should both be reading books on marriage, relationships, affairs, etc... and going to some quality marital counseling. If possible, you should consider waiting awhile before having kids. It's best to have a strong marriage before going there.
A couple good books "Not 'Just Friends,'" (great for understanding affairs and healing from them), and "Getting Back Together." Even though you are already back together it's a great book for helping to reconnect during and after a separation.
Best of luck to you!
There is no arriving, ever. It is all a continual becoming.
