Confusion...

Dear Readers,

Me and my boyfriend have been seeing each other for 18 months and together as boyfriend and girlfriend officially for just under 8 months. As in every relationship we have had our fair share of problems but recently I can't help feeling as if I'm not good enough for him. I love him to bits but, he's hurt me to many times before and my head never forgets and I don't know what to do. I believe there is a thinner, prettier, more beautiful girl out there for him who would be a better match for him. My heart tells me to stay but, I don't want to get hurt again and I am totally confused as whether I should hope its just a rough patch and ride it out or to walk away. Please help and give me some logical unbiased advice?

Racca Jnr