Is these signs that he want to end our marriage?

My husband and I have been together for over a decade. Recently he has been seemingly trying to hurt me and make me angry on purpose. He says things that he know would hurt me or start a big argument. When I explain to him that he seems to say hurtful things to me deliberately, he denies that he is. He always seem to put the blame on me, either I'm being too sensitive or I'm over reacting. He always say that "he didn't mean for it to come out that way". He also turn me down for sometimes. I asked him is it because he isn't attracted to me anymore and he get upset and say that he is just tired. And that at work things are stressful for him. So I stopped initiating and found that he is content with making love just five times a month. Before, I would initiate and we would make love about 5 times a week and he would only agree to appease me. The love making is wonderful when it does happen. He tell me that he love me everyday and I do not question that he doesn't. I just do not think that he is in love with me. I've notice while we are out together he stares at other women a lot lately. He doesn't look at me the way he stares at other women anymore. I have other men that flirt with me and ask me out all the time. So what is the problem? Why isn't my husband showing me the attention that I get from other men? I've asked him several times and he won't tell me the truth about what is going on with him. I am sure that he isn't cheating. He come straight home from work everyday and we are together almost every weekend together. We do not argue about anything other than this issue. I love my husband and I want our marriage to work. But how can I get him to open up about what is happening to him? I try to give him his space. And I thought that maybe we were just spending too much time together and that maybe we needed a little time apart. So I suggested that he go and spend time with his friends and hang out and have fun, but he say that he just isn't up for it. I've asked him to talk to me and for him to be honest with me and tell me what is his problem. How do I get him to open up? Advice please?