questioning

My boyfriend and I have been together 9 months. He's 35 and I am 44. In the beginning of our relationship, the sex was wild, spontaneous and often. We pretty much went from 2 dates to living together. Now we are moving across states and in a very stressful time. He has quit his job to prepare for the move and selling most all of his things to come with me. I am well aware of how stressful this is for both of us; however, lately our sex life is really suffering. Since leaving his job, I've noticed that he doesn't last very long when we do have sex. Also, the frequency of sex has drastically diminished and the spontenaity as well as the passion is waning. I'd like to think that this is all stress related. My fears as an older woman is that he has lost interest in me. I know that porn and chatting on line with other woman were a big part of life prior to me. I don't know the frequency of which he still engages in either; if it is total lack of desire, I assume he wouldn't want to be physical with me, or that interested in porn or other fantasies. Of course, there is no way to know if sex with me is being supplemented with porn, or if it is just lack of desire for me, or due to stress. I would appreciate it if any one has any advise. Lonely and hurt and feel rejected.