How old is this girl? Relationships have arguments, but it sounds like they are all one sided(for her). And as for her claiming that she is not the center of your world, I guess she expects that.....Dude find the courage within yourself to leave her!!!! She seriously has some issues she has to discover on her own. She is not ready for a serious relationship. And are you prepared to handle someone with such issues?!?
About the tires....you did nothing wrong, she was sick and you wasn't, her problem not yours. You are 1 person, remember that.
Are you afraid of losing her, or are you afraid of being alone? 10 months...sure it will be hard to leave someone, but you are 25 and you shold not have to go through things like that. As for marraige, if she has this big of a leash on you now, just imagine how big of one she will have on you once you are married to her?
It really sounds like she is taking advantage of your lack of experiance in relationships, which is extremely selfish on her part. I am not degrading you, but she needs to look for the innocense in you, and appreciate it.
Do your best not to waste anymore time with her, there is plenty of women out there. Do you really think she would stick around if you put her through the same things she is putting you through?
Both you and her need to realize the 2 of you are EQUALLY DIFFERENT. If she can't respect that now, it's hard to tell if she will ever respect it.
I was in a relationship similar to yours, except she was not my first. I had to put up with her accusing me off wanting to cheat on her or not wanting to spend time with her. She wanted absolutley all of my attention, I couldn't do that, but I tried to make her happy. It lasted 3 months, I lost my job, insurance on my car, and tons of will power because i left it go on for 3 months. Reason for all that was because before I got with her, I told myself I was ready to settle down, I would do whatever it takes to be complete......HAHAHAHAHAHAHAHA. Needless to say I got a reality check. 1 person(myself) can not settle down with another who is not capable of settling down. Bascially what I mean by settling down is getting married.
It's true you have to be ready for that, but you don't have to marry someone who is not ready for it. Nor do you even have to be with them either. Sure there could be a day she will grow up and come to her sences, but by then her insecurities may have gotten to you. Depression is contagious. And then she may not want you. You have your own choices, don't let others make them for you.
Best of Luck!!
Impossible is a word only to be found in the dictionary of fools.
Napoleon I