My husband (42M) and I (37F) met online and have been married for just over 7 years. I may be completely nuts, or maybe the seven-year itch superstition may be affecting my brain, but should I be worried at all? 

We married shortly after we met, and have (what I would call) a happy marriage. We don't argue very often, and try to talk to each other as much as we can, as he works and I stay at home with our kids. I am a bit bored, and lately I have been a little distracted, but for the most part, I am a happy housewife. 

My husband has a demanding job, and the website was a side project that he did with friends, but lately, he has been spending quite a bit of time and energy on it. He created a website which allows people to date/cheat without friends or family knowing. (please check it out; I am not 100% sure I understand how it works.) I have no idea what he does with it personally, although he is very, very enthusiastic about his project. 

He has never said he is unhappy in our marriage, but I am just a bit weary of his enthusiasm. Our sex life has dropped off a bit since he has been working on the website (he has said that he is tired; I didn't question this). I don't monitor his online activity, he rarely brings his work home, and we seldom use our computer in tandem, so I can't really sneak a peek at what he's been doing online. 

Is it unreasonable to be suspicious? Are there ways to ask him about it without sounding paranoid? Or stupid (I don't know very much about computers)? I know he had cheated on his girlfriends in the past, but is it too much paranoia on my part to look at his past record as proof of his possible (and/or future) infidelity?
user
Husband is enthusiastic about creating dating utility on the internet, I am not. Is
assistant
My husband (42M) and I (37F) met online and have been married for just over 7 years. I may be completely nuts, or maybe the seven-year itch superstition may be affecting my brain, but should I be worried at all? 

We married shortly after we met, and have (what I would call) a happy marriage. We don't argue very often, and try to talk to each other as much as we can, as he works and I stay at home with our kids. I am a bit bored, and lately I have been a little distracted, but for the most part, I am a happy housewife. 

My husband has a demanding job, and the website was a side project that he did with friends, but lately, he has been spending quite a bit of time and energy on it. He created a website which allows people to date/cheat without friends or family knowing. (please check it out; I am not 100% sure I understand how it works.) I have no idea what he does with it personally, although he is very, very enthusiastic about his project. 

He has never said he is unhappy in our marriage, but I am just a bit weary of his enthusiasm. Our sex life has dropped off a bit since he has been working on the website (he has said that he is tired; I didn't question this). I don't monitor his online activity, he rarely brings his work home, and we seldom use our computer in tandem, so I can't really sneak a peek at what he's been doing online. 

Is it unreasonable to be suspicious? Are there ways to ask him about it without sounding paranoid? Or stupid (I don't know very much about computers)? I know he had cheated on his girlfriends in the past, but is it too much paranoia on my part to look at his past record as proof of his possible (and/or future) infidelity?
user
the husband I met online created a website for dating/cheating. (I hope it's not
assistant