Sampo was sorry. He regretted that he succumbed to the temptation of a beautiful woman and cheated on his love. It's not your fault, he just can't be completely faithful. That's why he's texting you now, in the hopes that you'll accept this fact and not grieve too much.

"I'm in the apartment of a pretty pretty blonde right now. She's undressed, I'm not dressed either. I'm a bastard, a drunk bastard. I'm not going back to you. Throw away all my clothes, better burn them. I am not worthy of you, my love. Even despite my efforts, I will not improve..."

These are not the messages you expected to see after waking up. Perhaps your relationship was not the sweetest, but you did not think that it would come to betrayal. He could perfectly imagine how the expression on your face would change when you woke up and saw his bitter confession. He's truly sorry, but he won't change.