<human>: Can you condense the text into three sentences or less?

So we've only been dating for a few months, but have been best friends for over a year and a half. We know everything about eachother: the goods and the bads. 

Recently I severely injured my ankle so I couldn't go to the gym and do my normal physical activities. She claims ever since then I've changed and have become lazy. She says that I make excuses for a ton of things whether it be petty or something large. To and extent she is right, but I feel like she is being a little harsh. 

How can I talk to her and help her realize that I'm trying my best to be the best boyfriend I can be and that it is impossible for me to be perfect. 

I'm not looking for "break up" or "leave her". I genuinely want to fix this because I have been in love with this girl for about 3 years.
<bot>: We have been dating for a few months, I need to talk to her about her being too critical about how I act.