My girlfriend questions my feelings for her no matter what I do or say. I don't know what to do. Help me?

She may be very insecure. She may feel that she isn't good enough for you or that she's weird or unreal. She will always ask you, just to make sure that you're still interested and that she isn't getting on your nerves. If it bugs you, you may try to find funny and inventive ways to answer her. For example, maybe you could say (sarcastically)
"no, no I completely hate you. *wink, wink* " or
"I just can't stand you *nudge and hug* "
my advice: just try to be patient and understanding (and tell her you <3 her ;p )

Its not worth it for you to constantly defend yourself that's crap ask her why she doesn't trust you and if its a load of bs then you are better of on your own then to have her keep buggin you but if you don't want to leave her then talk to her about it maybe she had a bad relationship in the past and that's why its hard for her to trust you. Just try talking to her and see what she says but if it keeps happening after you guys talk its not worth it for you.

Dump her, and get another girlfriend. Two months is early enough for you to bail out. No need to be in a hostile relationship, unless you're a masochist of course.

She sounds very insecure. Was she hurt by another guy at one time? Sounds like it! If you didn't do anything to make her doubt you, all you can do is talk to her, and reassure her that you care for her. She should come around eventually if you keep telling her how much you care for her. You might try some romantic gestures such as buying her small gifts, or flowers. Its too bad when this happens; especially if the guy pays a lot of attention to his girl. Good luck, and don't give up on her!