If you want my honest, straight advice: honestly, get over yourself a bit.
You don't 'need help'. People having affairs often do this - "it's pathetic", "I need someone else to make it feel real", as though 'lust' is some all-conquering force you can't fight against and it's so hard for you to to stop.
You can stop any time you want. You're a grown adult with agency and choices.
You keep choosing to fuck/text someone else's boyfriend, the father of someone else's child. You don't need 'help' ro stop doing that, you just think you do because you keep thinking of yourself as a 'passive bystander in a situation that just can't be helped', like some kind of lovelorn Disney princess. It's why it was easier not to feel guilt before - why should I feel guilt, I almost can't help it so I am making myself a passive participant and therefore not responsible - and why it's harder now - actual consequences are staring you in the face and you've been shocked into not contacting him and you've realised you are FULLY in charge of your actions.
I say this as someone who was - briefly - sleeping with someone else's partner when I was in my early 20s. I was all, I don't know how I could possibly stop, I don't feel guilty because I can't even help it, etc etc. And then my mother - wise woman that she is - said "You can help it, you're just choosing not to.".
And the guilt then hit me, that I was choosing not to stop, and I had to reckon with what kind of person that made me.
So... stop pretending you don't know what it would take to make you walk away and that you need strangers to tell you to do so, stop acting as though it's so 'pathetic' how you just can't help yourself.
You know full well why you should stop.
You know exactly how to stop - you just stop.
Own your actions and your part in it and the fact that you have chosen so far to be part of an affair, and that you are choosing not to do so any more.