I Have Something to Say

now my mum is very sick and she asked me to get marriage
but
i have a problem
I'm still love my Ex GF who i left her because after two years of hard and strong love i discovered her name is not real it was fake name , could you imagine two years i had calling her by fake name, and fake age and it was big lier and amazing actress . we had video calls everyday , woke me up every morning and talking till i hear her snoring ,
and then it wasn't only one to do that with him in same time no she spoke to many guys too.
After i discovered the truth i trolled and investigated her and everything is truth and after i faced her she can't say no or anything because i had all evidences ( pictures , screen-shots and recorded calls between her and others guys ).
now i'm confused what should i do
listen to my mum but i don't love this girl ( yes she is pretty , smart , honest ) but im still love my ex gf :(