How long should I tolerate no intimacy from my husband?

We are young (28 and 30) and have been married about two years. To make a long story short, our sex life has dwindled down to nothing. We have not had sex in six months. My husband does not act bothered at all by this. After I finally confronted him about his lack of libido, he admitted that he knows he as an issue and does not know what is causing it. He swears he is not cheating, gay,unattracted to me, or anything like that. He has given me every reason possible to not want to have sex in the past two years (tired, stressed, just showered). He just has no desire and thinks maybe the problem is medical, like low testosterone. He said he would go see a professional and this was over a month ago. He has done nothing toward fixing this and we only talk about it if I bring it up. I'm sick of being the only one trying to resuscitate our sex life. He likes to cuddle and kiss and that's as far as it goes. I've taken all the pressure off and I gave up being the only one to initiate anything for the past year. I am bored out of my gord with my marriage now. Sex is not all that is important to me, but that's how he sees it. How much longer should I put up with his lack of interest in fixing our intimacy issues? I am really resentful at this point.