He searches for girls on social media

I’m married to a man I really love but for over the past three years he has a habit to search for girls on instagram. Some are random hot girls that I can never compete with and some are girls he’s known for years. He masturbates on their pictures and most of the times does it when I’m home waiting for him in bed. It hurts my heart that I am not enough for him. I trained myself to stop getting affected by it but I always end up hurt.

Do you think this is considered cheating?