No it is not bad to masturbate everyday its perfectly normal! Although you could get so used to pleasuring yourself that your mate wont be able to pleasure you. But as for losing sensation I dont think that would happen. I think him knowing that you keep pleasuring yourself is making him think that hes not getting the job done making him feeling useless maybe you can do it in front of him to kind of give him a since of what you like. Let him know that nothing is wrong with him, but it's just something you like to do

Actually I think it might do something... I have a bunch of frinds wo have lost sensations in other parts of their bodies from sports injuries. To me it'd make sense that from constant rubbing your doing something to those little nerves, and I doubt it's making them stronger

I dont believe that you lose sensation down there, but I do believe that the orgasms are probably less intense. Like yourself, I am a self-confessed self-pleaser and I usually make the rounds once a day (with multiple orgasms - 5 or 6 orgasms per session is the norm). Recently though I was in a situation where I pretty much couldnt do it for about 2 months, and when I did it after that I had the best orgasms ever. Once I started up every day again though, the intensity went back down to normal. I feel very lucky to have had so many orgasms in my young life, and they are the best stress reliever! Dont stop just because of your boyfriend - guaranteed he probably just feels a little threatened or insignificant because you can get yourself off. Assure him that he is invaluble in the bed, and make him feel good about himself, tell him nothing beats his abilities etc (if this is actually the case), and I bet he'll forget all about you and your hand.
Ak