Well, if you're serious, you're a very sweet girlfriend, indeed
I assure you though, with the parameters you specify, you would set him up for certain failure.

A scaled out Cessna isn't the best first airplane, for one.
Especially when a person isn't going to have access to experienced help.
"Flying" the full scale is easier than flying the models, though neither are that difficult.
It just that, like flying the full scale plane, he will require at least some instruction and help,
to become proficient with the models. A person can teach themselves, if they
have unlimited patience and money. The crashes are usually frequent and painful.

RC can be a bit more difficult, because the controls are reversed when flying toward you,
you're not IN the plane, so you lose the "seat of the pants" feeling, and you lack
an airspeed indicator, stall warning horn, and all other helpful full-scale amenities.
The trashcans are full of plane pieces, from full-scale pilots who tried it without anyone's help.

It would be far better if he were to get involved with a local club, and if he obtained
a "trainer" plane, at least until he becomes totally comfortable with RC flying.
There's no shame in that game! We didn't teach ourselves to read, either

Just my $.02.
Hope it helps!

Chris