How can I stop being so jealous?

Me and my ex broke up recently again. We live together and it has not been good at all. But i can't afford to move out and we live with 2 other roommates so for now I'm staying there. I'm always seeing girls on his phone. He says he isn't seeing anyone or doing anything with anyone and he's just focusing on getting his life back together. But seeing all these new girls he's talking to really bothers me. We aren't together so he can do what he likes but I just want to find a way that it won't bother me. Won't make my anxiety really bad. Anyone got any suggestions that don't involve going out and fucking someone else? That's budget friendly aka don't cost money
How can I stop being so jealous?
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