Thank you all for useful replies. Similar to Fairydustgirl, I also didn't ever have intentions to marry him, and I always tried to enjoy his company when we are together. Because he is a good person, with great sense of humour and we usually have fun together. I don't see us in future and I know it was never his plan either. But it's been almost 10 years and it's getting down on me that I lost my youth and all hopes for normal relationship for just an illusion.
He currently has no job, he does take care of his parents, but before they were old and sick (and that was like 5 years ago), they did do everything for him. He did pay the bills though, whenever he had any money. What I also notice is that he is losing his career. Lately he has no time to work (as freelancer) because he mostly works around them, and he does not want any office job (because he would be apart from them most of the day), but insist on freelancing. Of course, lately he has no job. I feel like he is to picky but he can't afford to be picky about job. I am starting to see him as person who does not fight, who is losing, and that is not good.
I still love him but I am losing respect for him more and more.
Healingme4me, I will never ever be his first choice, maybe not even second one (that would be his job), but he is not my first choice either (it's my child). I don't expect anything from him anymore and that is sad. I stopped expecting anyone to love me and put me in the first place. What is worst, I can't just now, after 10 years of fight just give up (message would be: if you see your relationship going nowhere, and you feel growing resentment, even if you love him/her give up as soon as possible, do not wait 10 years).
Now, I would just like to ease my resentment by finally understanding WHY is he so obsessed with them? More so, why he feels the need to defend them and praise them all the time. Parents are never ideal, but they do what they think is best. his parents did a lot of wrong, worst thing making him completely dependent on them, they are surely not great parents. I feel that because he lived with them so long and they did take care of him all their lives, now he feels that he needs to repay them somehow by taking care of them. Could that be it? But why not admit, they did not do a good parenting job. Why he feels he needs to tell me how great they are, how he loves them, how they are perfect, and if I try to say that it's not healthy way of living, he gets angry and defensive. I feel like if I tell him the truth it will crush him because he needs to believe in his little world.
When I realise that I usually fell into depression and start to avoid him, which is incredibly easy, because he does not try much to contact me or to see me when I am depressed and want to be alone. He just calls me "spoiled" and that "I don't even try" and he then waits for me to call him first (which also always happens).
What is wrong with me? Why can't I just accept things as they are, and not care? If I love him, why do I still resent him because of all this? I feel conflicted and very unhappy. I tried to broke it up with him many times, but I felt so miserable because I missed him and (I know how this sounds) he is actually my only friend. I am a sad sad person.