Girlfriend told me I'm small (should I end it?)

Hi everyone, So I've been in my current relationship for about 3 months and everything seemed to be going fine. We get along and there is a very strong mutual attraction between us (we typically have sex 3-4 times a night). The only issue is that my girlfriend has (not so subtly) commented on my size 3 times. The first two times I brushed it off but this last one got me pretty angry. After we had what I thought was really emotional sex the other night she asks me' if I ever wished I was bigger' and follows up the question immediately with 'have I asked you that already?' (which she has). I smiled through my anger and asked sarcastically 'why? do you wish I was bigger?' at which point she says 'but you know how to use it'. She saw how upset I was and swore it didn't matter and that we have great sex and that I'm good because I like to try other things. But if the sex was so great why bring this topic up at all? I would say I'm slightly below average (just over 5 inches in length) I've had girls in the past comment negatively on this before and every time it does tend to be a blow to my self esteem. I get that I'm not an ideal physical specimen but in all honesty neither is she. Anyway I'm thinking about ending it with her now as I'm not sure if she said it to be cruel or is actually so emotionally immature that she didn't think that asking me that would hurt my feelings.

Five inches is good enough. rest easy, ponder. Don't let her put bad mojo on you.

In my own opinion, I would sit her down and talk to her about it. Through my own experiences I've learned communication is definitely key. Tell her how it makes you feel because it does make her sound very shallow. See how she reacts and if she is willing to stop making comments or explains what would please her more. If it continues I would cut the rope. Don't bexpect with someone who makes you feel bad about yourself.