I'm in agreement here. You've already gotten your answers; don't become the kind of Nice Guy other nice guys want to kick the ass of for making them look bad. If it's as Vector said, I'd stay as far away from obsession as possible. It never ends well.
Having been a Nice Guy myself in the past, pursuit only gets you deeper into the pit. Being given hope only helps the ego, none more than that. Your situation and future encounters won't improve with just hope alone. This also applies to anyone else that makes it a serious business about getting a woman (IE- the types that want to get laid more than anything; admit it, Nice Guys are guilty of this too.). The best advice is give up and worry about (only) yourself. Sure you'll come off as/eventually turn into a bit of an asshole (or at least a seasoned veteran in attitude), but as evidence shows (IE- The most dominant Nice Guy complaint), that's what women want. Not necessarily the 'Asshole' per say, but someone that looks out for themself, and not whoever they're with (or have eyes for); in most cases, exclusively.
Similar can be applied as to what guys seek in women. Sure, the damsel in distress, and numerous other feminine/romantic tropes, are nice fantasies; but in reality, they're actually quite impractical and annoying. Who wants to save a woman, or in fact anyone, from everything under the sun? The satisfaction only lasts so long until you finally get bored of saving them, or it gets in the way of your schedules.
Albeit, I'm still single myself (and trust me, I followed every trope and cliche that Nice Guys do to get a women they like to return the favor. None of them work.), but I don't care anymore. BTW, with my more recent personality, practicing what I preach, and so forth after giving up, I've actually been, at least, given a glance of attraction from some women at times (even though I'm mostly blind to such things, as is (side-effect of being a Nice Guy for so long; radar is dead or severely atrophied from prolonged failure), and have to be informed by whoever's with me who took notice). Put enough effort in improving yourself, and the roles will be switched, and you can decide what to do with the next Nice Girl (or good person) that comes your way, and show attraction towards you. You have no idea how much more satisfying that position is, than chasing someone. When you're the one being pursued, then the ball is in your court this time.
In case none of this gets through to you or anyone else (I'm looking at you tl;dr's), then listen to this: Don't let the bitterness of failure make you bitter as a person. It'll only make everything worse in the long run, and that class of asshole is repulsive to everyone. The only kind of people that attracts are the kind of internet trolls that live off of ruining livelihoods and reputations. And those people suck.