I absolutly believe is positive visualizion.
Tiger Woods believes it it.
Positive things come to people who think positively.
The key is to get past your doubts and truly focus on the positive.
Helpful tips.

1. always tell the truth (this allows you to simplify your Ego and allow you easier access to your heart).
2. Vent out your negative energy daily(let everyone know you are venting and get it out)
3. Find 10 minutes a day to meditate. (I it is very difficult to achieve a meditated state, so just 10 minutes of positive self reflection in quiet is all you need)

This takes time. At least 3 months before you really feel a change.
Then you will start seeing things happen the way you want them too.

FYI
You love him and your pregnant.
You will see him again
Show him how brave you are and tell him that he is missing the best
part of his life if he walks away again.
Tell him, You have forgiven him and that you know, that if it were meant to be, he would come back, more loving and focused than before.
If he disses your forgiveness, kick him in the balls and move on.