Devon is correct in his advice, you should play games more in your strength then his,but even so i wouldnt feel defective around him because even though you feel insecure he loves you for other reasons, also to be has intelligent as the other can cause more problems then you could believe.
at least you can recognise his strength's but now need to find your's,its not really that difficult.
Good Luck and enjoy this intelligent man and stop belittling yourself at least your happy in the other aspects of your life with him
A mistake is always forgivable, rarely excusable and always unacceptable.
Robert Fripp