If you're going around helping and doing things for others expecting favors in return, you'll become an upset person pretty quickly. After reading what you and @jinmi17's perspectives were on the matter, I can say that I lean further to where you're coming from.

I find that when I do things that help someone else and genuinely mean it, most times, I completely forget that I didn't even did the thing! There's no reason to keep track, no ulterior motive that I'm trying to fulfill, and I feel lighter because of it. The best part about this, is that when someone does help me back, I'm completely surprised.

Now this may sound like whimsical garbage to you, but a selfless love is something that is learned. People may ask why a person would help someone for no reason because they can't see your values, and how helping someone else is the reward. Everything else is literally a bonus.