Lyric discussion by theonlybuster 

The song can be interpreted multiple ways, but the consistent theme is bilateral use. Person A uses Person B just as Person B is using person A. The last lines of the song make it clear. He clearly doesn't mind being used because he's also using the person to do the "things" they do.
More interesting, just before saying this, he makes note that one needs to be aware as to how they use someone as whether the use is good or bad simply depends.

Though I will say then when I was younger, I saw this song as a very underlined sexual song. In my young male mind, I envisioned a guy being used almost purely as a sexual object for a female, but in public she frequently belittled him for her personal enjoyment. In the guy's mind, he didn't care because he knew what was soon to come. Again, just another case of bilateral using.

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