The answer is to not worry about what your boyfriend thinks. If he truly loved you then he would not want you to change. The reason the two of you are together is because he liked you in the first place. Maybe ask him what it is that he liked about you. Have you changed in any way? If not then you should not have to change yourself at all. If you have changed however then maybe look at how and what you can do.

Maybe you could be more romantic or show him that you love him more through hugs etc. If you are quite argumentative then try and be a little clamer, but if you are beign treated unfairly then you do have a right to stick up for yourself. Basically you should not have to change but if you have changed since you started being with your boyfriend then perhaps you might need to.