Two thorns on one ride sounds like you just went through too many thorns!
If you find you're 'always' getting punctures then it could be what Steve H says. Or it could be that you ride where the spiky stuff is. Off-road it'll be hawthorn trees, on-road you're probably riding in the gutter where all the glass and nails end up.
I usually bin a tube after 3 repairs but what's to lose?
You can get these armoured tyres, and you can also get 'slime' tubes that have green gunk in that fixes the puncture without you knowing that you even had one. However, all that does increase weight a little bit, which can make the bike feel slightly less responsive, but is probably better than getting a puncture though. I've (touch wood) had very little trouble with punctures over the years and now just use normal tyres and tubes with the correct pressure in. And I carry a spare tube just because Sod's Law says if I don't I'll get a flat.