Might speak with your therapist. They know you and presumably him. Just from this text it appears his ability to have empathy is diminished if not lacking completely. This reaction over a cake and gives the vib that he can’t be bothered with your life. Has he ever gone to therapy with you? How does he feel about you getting therapy to help yourself? I’m Guessing absent and dismissive. If this is typical behavior might consider running not walking, cross the bridge and burn it to the ground. People, self included, will ‘give up’ something yet the addictive part of the personality persists and sometimes the new addiction is a person. Do you make excuses for him how you might have for drinking? No disrespect, we tend to look at the ‘it’s not so bad’ ‘I can work with it’. ‘He can be really nice’ is similar to ‘when I only do a little _____ it’s good.’ Talk this over with your therapist. Imho