You could always use a traditional lighter if you don't mind it. (The BBQ lighters, not the small smoke lighters)
I've noticed this problem as well. The matches burn much too quickly. Yes, you could always get a long match. You could also set the lit match on a large pillar candle (So you're no longer holding it) and set that wick on fire, and then just tip the wick of the other candle into that flame. It's up to you.
It's nice that you're doing a spell for you friend, but it's to -help- any effort you put in. Their love life won't change if they just fall back on the spell. They need to do things as well. The love spell will only make it more... Potent.