Is con ti a valid way of saying "with you"?

[NoHablaEspanol11]

Instead of contigo?

[DLwasbetter...]

No, you can't use ''con ti'' instead of ''contigo.''

[NoHablaEspanol11]

Is there any particular reason?

[Lrtward]

The same reason we say he/him in English but not she/shim. It's just wrong. Irregular and weird, but that's the way languages are ;-)

[jdroege]

"Irregular and weird, but that's the way languages are "
Absolutely true!

[Chilotin]

No, it is not valid. It is not "con" + "ti" but it comes directly from Latin "cum tecum". The same for "conmigo" (with me). In Latin there were another similar forms, Portuguese keeps also "con(n)osco" (with us) and "convosco" (with you [plural]).

[Camilla-danesa]

thank you for making the Latin and Portuguese connections – I enjoy learning these!

[shichi-astre]

pretty sure it'll always be contigo

[IAmCrazyHope]

What about 'de ti', does that mean 'with you' as well? I'm looking at the bonus/flirting sentences now that I am further down the tree and one of the sentences is 'I am in love with you' = 'Estoy enamorado de ti'. I am wondering if this is just a different was to say 'with you' or if there is some specific reason why it is 'de ti' instead of 'contigo'.