She didnt have MONEY for me but she had money for her EX ! Please Read !!?

Me and my EX were dating for 4month. And her ex always try to get back with her. So her Ex Birthday was today & mines is a day after. She TOLD me she didnt have ANY money to buy anything special for my birthday, & i came to find out she bought her EX a dozen Pink flowers wid a love card & told her shes going to take her to the DRAKE CONCERT !! like are u serious ? im 16 and shes 18 , she always acuse me of cheating, she never let me see her phone. Please give me advice !