From your list of positives and again, this is my view. Jody will probably give you much better insight!!
1) He is still willing to 'give' to you with out prompting. He knows that visiting you in Poland will make *you* feel better. He still considers you.
2) He recognises your efforts and appreciates them by responding well - in a way he is telling you what works.
3) Again, he still wants to give to the relationship by carrying on with the calls. This is something you really pushed for in the beginning and informed him you wanted - he still wants to give you this so accept it gracefully. Even if you have changed your mind now about wanting them you have to go with his flow on this one as maybe he gets things out of it. Accept his gesture. You just have to recognise that these sessions are going to be difficult for you personally and you will have to find ways of dealing with that yourself.
4) You said yourself about his depression. Now he needs time to digest things, he's been through a lot.
5) Again, shows concern.
6) He is recognising that you have needs and is also trying to be there for you. In fact, you have to recognise that possibly he is not going to meet your needs at the moment but accept the gesture with grace.