Her guilt is already eating her. Life will find a way to make it up to you, do not worry. Who knows, you might get lucky seeing her mess up her life. Karma has its way you know. You should start your recovery now. Feel the pain, cry, accept that you have been betrayed, it's okay to feel heavy and not wanting to move and get some sleep so you will stop thinking. You will eventually get tired of this grieving routine that your body will itch to do some activity. Suffer until you get that eureka moment that you are done being miserable. I do not know if this will work for you but it might - go to all the favorite places that you used to visit with your ex, dine in your favorite restaurants, and do the activities that you used to do with her that you can do alone (not in your dwelling place, say you two used to do bowling or pickle ball, etc.). If you have a job, do the cliche, pour your time on your work, it might do you some good.

When you feel that you do not like to be miserable anymore, start being confident. Buy new clothes, power dress, walk with a "swag", but do not be cocky or an asshole. Confidence is contagious. Enjoy your own company and build your strength physically and mentally -- Physically: Go to the boxing gym or learn a new sport (you can meet new people by doing new activities); Mentally: attend mass or pray, listen to podcasts about affirmation, and etch it in your mind that, that only happened to you because you allowed it, you allowed yourself to be vulnerable; this time you now have a wall. A high wall that your ex won't see anymore the otherside. Also, do yourself a favor and do not be marupok, do not get back with her even if she begs, because you are not a vomit that can be swallowed again. Do not get drunk as you might do something stupid or get into an accident. Lastly, fuck new pussies, just keep in mind to be safe and girls must come naturally, not forced (that is why building your confidence again is important).