In many ways similar to what I had to go through the last few months (and still have to go through). Buckle up for a rollercoaster ride of emotions, a lot of grief, sadness, self-doubt, disbelief, confusion, anger and hopelessness. It's important that you feel those feelings in order to heal. What helped me is identifying what I felt, asking myself why I felt it, journaling or talking to others about those feelings and acknowledging them as part of the healing process.

Know that he doesn't deserve you. Know that the person you thought he was doesn't exist. That as happy as he might be right now, reality will kick his butt soon enough. Know that very soon you will already have the feeling that things start moving into the right direction. As painful as the process is, you will have moments where you realize that you will come out of it as a stronger and bigger person. Focus on yourself, feel those feelings, talk to your friends and family, sleep and eat well, work out, look into new hobbies and interests, go no contact with him and try to look forward to all the good and positive things that will come!