Verified answer

Though it seems an incomplete sentence it is a slang sentence that means:

"Loving you truly, by far".

(Or it could be: "She loves him truly, by far". Depends on context)

The couple of words "Con mucho" means "By far" or "a lot".

Lo quiero de verdad con mucho is an incomplete sentence. But it means I really want it but with....

it means : she/he really loves him with a lot of.

your sentence is not complete