If not me than who

I believed I entered into a relationship with a good man . We became best friends ,talked all the time ,had great sex . The newness of the relationship started to wear off rather quickly . This was a little concerning to me . I wasn't sure why but I would try to talk about it with him and he would get mad at me for asking questions like "do you not find me attractive anymore " or " why don't you talk to me anymore about anything" he would just yell that he did love me and nothing had changed . I started feeling like maybe there was someone else maybe he was talking to another girl. He would erase his messages on his phone and call log . When i would ask why he just say there was to much stuff there . I didn't believe him this would happen at random times . I noticed search history for restaurants that he never took me to on the computer . No hard evidence of a affair but red flags in my mind.I work at least 8 hours everyday sometimes 12. We share a vehicle and he doesn't work . However, he does contribute to the bills . He no longer helps do anything around the house . I have to yell about this to get him to lift a finger and when he does help he does as little as possible . WE have sex about every 8 days never like it was . I left for work today and decided to come home early. (I NEVER DO THIS) I get home and he is in the shower . I can see the computer is on so I look at the history . I see all of this sex stuff from good position for your lover to how to have woman all over you . When he got out of shower I asked him about this and he said he was looking at it for me . I highly debt that it was for me . I asked him if he were cheating and he yelled so rudely no. I didn't feel anything but hate from the way he spoke to me . I don't know if he is lying . I just need to see maybe another point to view . Please help me with any ideas that might help me decide whats going on here .

I don't think he's cheating really. As you say there is no hard evidence. And you suspicion sprung up rather randomly? Which I must assume was down to the mere fact your relationship felt off and weird. You got bored with it basically and tried to poke holes in it, and you found this hole to poke through. His reasons seem pretty valid really, he deleted stuff of his phone cause it got clotted up with a lot of random stuff. He look for ways to improve your active sex life. You seem to just randomly loose your trust in him? All because you had this random feeling? Which isn't very accurate at all, most of the time. I personally think your relationship is fine, apart from him not doing anything around the house. He should help with that.

No sex every 8 days is not normal and he is tired of you if not straying. Ask if he wants to move out. If he does it is better for both of you. Help him. If not it might wake him up.