Girlfriend Had Bigger

I’m a '25M' with a '23F'. She’s loving, kind, sweet, and just about everything you can possibly ask for in a woman. Our relationship has been great for the past two years until she’s informed me that my penis is on the girthier side, which made me question her motive in saying that. Is my length insufficient? I started to think maybe she’s had an ex with more length than myself, etc. My penis is 7 inches in length and 5.5 inches in girth. I think I might be in my own head here but people only make exaggerated comments like that when they see something that they’re not use to, which tells me that she’s used to my length or more. Which opens up the doors of retroactive jealousy. This is extremely concerning to me and I can’t ask her these questions of who had the bigger penis, etc. I might have to let her go.