Personally, when anyone doesn't respect your decision not to take out a loan to help them...and then remains pissed about it, is just not worth your time.
If you're truly "together", he'd show you rather than acting this way.
There are far too many out there who try anything to scam others out of money, including getting into a relationship. They pretend to pour love on you. Try to get your account info, get credit cards from you,etc.
I say just be careful.
If he really loves you and wants this relationship to work out, he'll get over being pissed and move on. Best of luck to you. ☺

The scheme doesn't make much sense to me, unless I'm missing something.
If someone has disposable income and wants to accumulate savings, why would they take a loan (a lump sum of money) and pay it back with interest, rather than simply putting away the extra money and earning interest on the savings?

Hmmmmmmmm, are you sure you are a priority in this relationship?

Good call, that loan would have made no sense at all unless he was planning to abandon you. If he wants to build a saving for himself, let him put the money he was going to pay back, into a savings account.

Keeping finances separate sounds like a -really- good idea in this case.

At best he sounds very immature.
At worst he sounds foolish with money.
Either is surely a wake-up call on what your relationship is really about !

He should be paying back for all that you have done for him. Keep your money.

Warning! This is NOT a good relationship. It's evident that he's more interested in himself than you (despite what he may tell you). One does NOT take out a loan to get savings. That's just stupid. He also sounds like a user. He'll use you (and your finances) and when he gets you deep into debt, he'll up and leave. The red flags are there, but it's up to you.

Dump him, get rid of the mooch, tell him to kick rocks.....

He is
Idiot
Scum
Manipulative
Dirtbag
Fool
&
Just Stupid

Run!

He'll spend every dime on bullshit.

Good luck.