During the depression phase, you will cry a lot. Crying is normal, and tears are healing. Let yourself cry when you feel like it. If you cry constantly, everywhere, and it goes on for months and months, you probably need to seek medical help. Anti-depressants will help you deal with severe grief.
Forgiveness is a necessary part of healing.
It is also a process. You can make up your mind that you need to forgive, but it sometimes isn't easy, and it smay take quite a while to completely forgive the other person. Don't try to forgive too soon in your grief process. You have go go through the anger and the guilt and work through both thoroughly before you can forgive. You have to forgive both yourself and your spouse in order to heal.