My boyfriend has grindr app on his phone and has transformed into a slut

We have been together for 8 yrs and just found out that he has recently been seeing two other guys behind my back.
I am gay obviously, and
we have had a monogamous relationship up until now.
he still denies it but admitted it to his mother who we live with. Right now he is with one of them as i sit at home lonely and bored. We broke up earlier tonight, so I can't be to annoyed. He is a compulsive liar too which doesn't help.

Grindr is an app for single guys, so if anyone out there in relationships have this shit on their phone, expect cheating, lying and a broken heart.
Worst of all he basically lives on his I phone, along with the rest of I phone users, which ultimately will divide the world one day into real people that have face to face conversations and the I phone users who live from and through their I phones.

On the plus side I will be moving into a nice pad tomorrow, it is right on the water in Port Douglas.