My boyfriend played with my feelings and has caused mr severe emotional trauma and mental torture

I was in a relationship with a guy for 2 years everything was good in the beginning as he and I both said we havr true love and had the promise that we'll never leave each other and that breakup is not an option then suddenly after 6 months he said he has lost love and I asked why he said I don't know and listening to this I realized he only faked love me and he never had true love so I just left but he came back asking sorry immediately saying he didn't mean it and he just told it by mistake out of stress not just this he said very more hurtful things but he kept calling and messaging me saying he truly loves me and wants everything back then when i said okay but this is the only chance I'll ever give If u ever say break up or say I don't love you then it'll just affect me a lot and i can't bare it then he promised to marry me in future now recently i found he cheated on me so we had a small argument then from that day of argument he is ghosting me ,running away and not talking or meeting This is mentally and emotionally effecting me a lot This is absolutely not right Can i take any legal action on him? How can someone just play and fake love with a girl and just run away???