Erectile dysfunction and no sex drive whatsoever...

So we've been married for over 8 years, last time we had sex was using viagra and to conceive our second son who has just turned 2 (so 2 years, 9 months of nothing) and he sleeps in the middle of us (we are super protective of our kids) but I think he is using them as an excuse. I'm miserable and heart broken inside feeling ugly, rejected and invisible but he is such a great father and hard working man I don't know what to do so I just cry silently. It's not really something I can tell around so nobody knows...i tried talking about this with him many times before but he is just not into sex so that kills my desire for him too