Work and love together

I am in a relationship from 3 years. We met in college three years back and now we are working together. Our love life is just fantastic and good going. We can rely on each other frankly. When talking about our work life it is also good going except the thing that not intentionally but many times take credit of the work I have done. I never kept something private from him in these three years because he always behaved in the position of my missing father. But his going nature and behavior of this kind is continuously hurting me and killing me from inside. I always end up in thoughts that when everything is fine and good about us why does he do that. It is actually affecting my growth and confidence level in my career. Being the topper of the college I always work like a giant but if continuously my hard work and efforts will not pay to me it will definitely hurt me. Please help me!!

The best thing you can do is sit down with him and tell him how you feel and ask him why he does it.