Why should be a bad feeling if a partner is addicted to watching porn or masturbating?

Porn and self pleasure are both addiction. But as long as the two partners keep talking and feel comfortable about it. no worry.

Keep in mind that masturbating is very rough on the penis skin and can lead to serious issues like a loss of sensitivity. So make sure your partner uses a penis health creme once a day. These are made just for guys who masturbate a lot and will protect the penis skin from potential damage down the road. They are easy to use and safe too. Google them and check 'em out. Good luck.

Quite normal to be sad if your partner prefers porn and masturbating over spending time with you and not having sex with you as often. Sounds like time to get a new partner.

be happy that their with you and not out sleeping around

it shows he cares nothing about you