<human>: So we have been married for about 4 years already and everything was all fine, but lately for about the past 5 months or so he started in a this new job that is taking a lot of his time. This new job takes a lot more of his time than the last ones, and I have been really understanding with that and I haven't demanded him to spend more time with me or anything like that, only the normal "I miss you". Everything was fairly normal in the sexual aspect, except for about the past 2 months and a half that he has grown more distant towards me and doesn't show any desires at all, even when weeks has passed and I try to start something, he always responds with a "I am tired" or "I don't feel like it today", but when I try to talk to him about this issue like two adults, because we have always been really open to each other, but now he is always really defensive about the matter when I pull it up and it's basically impossible to talk to him. On a separate note I'm a woman that takes a lot of care about herself and I am really confident about my body so I know that it's not because I'm letting myself go, because it's not the case. I am not happy like this at all and I would like to do something about it. I've know him for a lot of years before we got married so I know him pretty well and he has never been like this, so I am growing really suspicious about him having an affair outside the marriage.  
I am really desperate and advise about how I can deal with this situation is very welcome.

Summarize the given text in a few sentences.
<bot>: My husband doesn't show any sexual desires anymore and even when weeks pass and I try to start something he always makes excuses up. Situation has been going on for months. Suspicious about him having an outside affair.