is cyber sex cheating?

ok my friend has been with her other half for 10 years and over the last few years things are not good, hes never been romantic or loving which b4 she didnt mind but now for some reason it does, i think its cos shes always been a big girl but since having kids shes put a lot of weight on and feels fat.
he touches her bottom and calls her sexy but she says it makes her made cos he knows she doesnt like it, but no matter how many times i say to her well he must still fancy her if he does it she wont have it and says she thinks hes doing to make her feel bad.
i never thought he would cheat as he doesnt seem the type but the things shes been telling me have set alarm bells ringing in my head.
ok this man has never been bothered how he looks and will wear the same clothes for days, he even does it when he has mettings at work but all of a sudden hes buying new clothes, going to the gym, and she found he hid some of those build you up milkshakes behind the sofa, he said he wasnt hiding them but why were they behind the sofa?
he goes to his friends pub once a week and wont let her go, he says its cos she doesnt like his friend, but a while ago they split up and her other half left for 3 days and then when he came back he told her that he was with this friend but when she texted him he wouldnt reply. so she thinks thats why he wont let her see this friend as he lied.
well when he goes to his friends he showers which he hardly ever does normaly, shaves dresses nice and seems to make a real effort.
he has also all of a sudden er how should i say this? started shaving down below, he also has a bottle of shower gel in his car.
he wont let her on the computer and gets up in the night and goes on it.
i think hes cheating which ive told her, i think maybe hes had cyber sex with someone then met them, or at the very least had cyber sex.
hes said to her b4 that cyber sex is not cheating, i think it is but what do you think ? do you think hes cheating?
do you think cyber sex is cheating?
she also thinks hes looked at amature porn vidoes on the net.
how would you feel if your other half had looked at amature porn?
ive told her i will come with her to the pub he says hes at and see if we can catch her out but i think shes scared what she might see, she has 3 kids with him, its such a shame.