Sqrl, pal, you’ve received some good input; let me add a little.
Someone above said something about stay loose for a month. Nah.
If you’re possibly good friends in the long term it’ll take longer than that. My SO of almost a decade and I split up a few years back. And we have a great relationship now - she’s one of my dearest friends, she knows me and I know her v-e-r-r-r-y well, and we’re friends for life.
But the splittin’ up was not easy (she fired me, BTW). While there were a few contacts in phone calls in the weeks following her move out (which I, of course, helped with), it took a year of almost zip contact before we saw each other again. That was time enough for both her and myself to construct lives that did not hinge on one another, and we’ve since come back together as friends who can enjoy the aspects of each other we like without the baggage of being mates (and all that entails).
As anyone could guess, there’s a lot more to the story than I can pack in to 10 or 12 sentences. I’ll resist the common Doper urge to talk more about myself (Hey! Where would MPSIMS be without that?) and try to make a point.
You’ve done both your acquaintance and yourself a HUGE favor by not letting something drag on that you already knew couldn’t work. That much you probably knew before you posted the OP, and you’ve been reinforced in that view.
My point would be that if there is some basis for a lasting friendship independent of an SO relationship, you probably need to give it a lot more space than a month. Let the romantic air clear to a point without a doubt. If there are lasting traits in both you and the other guy that allow a friendship to endure without contact for a long bit, they will survive the separation.
How do I put this? The enduring danger is that you’ll allow enough contact for the one with the broken dreams to maintain their fantasy - NO! He’s got to face up to a life where you are, at the least, an acquaintance, at the best a friend, but not the partner.
I hate this stuff, but it’s part of life. I’ve had to fire GFs myself and I’ve been fired more than once.
Good luck with it all, pal.