Cancer man and insecurities

I am an Aquarius woman going out with this Cancer man for a bout 4 months now. In the beginning he always tells me how beautiful I am and always says "I love you". I know he is busy at work and he would come out his way to see me. Sometimes he would say random stuff like what he would do to me in a sexual way. I remember I confronted to him that as long as it isn't anything that sounds disrespectful then its fine. I also told him that his breath smells and he looked upset. And I sent him this video about having a nice d**k and he got all offended. He hasn't talk to me for a week and I keep questioning about it. He said he needed space so I gave him more than a week space.I even apologize. We eventually met up with me and told me he was very stressed about work and I made it worse for him.

He now tells me he isn't comfortable having sex with me and that he isn't confident anymore. I read that cancer needs constant reassurance and I do not know what to do anymore. What should I do now?