OH GOD!!! wht do i do now????

i splited with my ex few weeks ago & i still cant stop loving him so i just msged him casually , & he smsed bak sayin tht who am i??? GOD!! wht do i do??? I had to split up with him due to unavoidable reasons:(main reason for my split)he behaved very rudely & made a cheap joke abt me instead of at least sayin tht he shudn have said that , he called up my frnd & told her tht there was no need for me to apologise