Hi, sweetheart.
Just another human with my suffering, feeling for you.
I would say it appears (given his previous behavior) you might consider stopping expecting him to remember.
Ask yourself:
How do you feel about that?
Is that okay with you?
What does that mean?
What do you want to do about you feelings about that?
You cannot change him/fix him/improve him with your boundaries, regardless of how desperately you may want to (and believe me I have tried!).
Who he is is who he is is who he is.
He
may be the husband that forgets your birthday.
Decide for you what that means.
Meanwhile, your boundaries are for you.
You can totally say:
A) I deserve to be in a relationship with a partner that remembers my birthday.
B) If my partner forgets my birthday, I will...(whatever you feel is appropriate for you to do that will take care of you).
Or you could remind him its your birthday.
What is best for you?
Can you just enjoy your birthday and detach from him about it? (Good for you for your art class!!)
Maybe you can. Maybe you can't. If it is VERY important to you, and apparently not to him, what does that mean?
Journal on it.
Continue to take care 'yoself.
Hugs.
(Happy birthday in advance)