From your viewpoint he is pulling away, not there for you, not committing, withdrawing, this is a test of the relationship and possibly a sign that everything is falling apart.
For him I'm guessing none of this is going on, he had a great weekend with you and has now been taking some time on his own for a couple of days for whatever reason. I would bet he's shocked that this is all going on in your mind right now.
DING DING DING! I think Zues hit the nail on the head here.
All the other stressors - work, money, boob - are making you see the worst in everything right now. Step back and calm down. (Also, on the boob thing, did you ask your plastic surgeon about financing plans? Many of them have them although I don't know what the interest rates are like.)
