Finn-Â She cheated on him with Puck and got pregnant, he was sneaking around on her a little bit with Rachel, she lied to him about the baby it was a mess. But there were sweet moments.
Puck-Â He got her pregnant and eventually she moved into his place after Finn found out, he told her he doesn't dig on fat chicks, tried to make out with Rachel, was still sleeping with Santana, dated Mercedes out of nowhere. She called him an idiot and moved in with Mercedes. It was also a mess. There were some sweet moments but not many.
Sam-Â She eventually cheated on him with Finn. More sweet moments than the first two, way more.
Finn again-Â He started liking Rachel again towards the end and broke up with her at a funeral. A lot of sweet moments this time around, still didn't end well.
A 40 year old skateboarder-Â Only thing known about this guy is Quinn dropped out of society over the summer and dated him between seasons 2 & 3. Nothing about this relationship could possibly be good.
Puck again- She didn't really date him this time around, she tried to use him to get back at Shelby and he tried to have angry sex with her because Shelby dissed him. He did realize she was unstable but didn't really do anything about it. Then she randomly kissed him in the finale to help him pass a test.
Joe-Â He got boners while helping her do her physical therapy which is gross, and then she started dating him until he faded to the background.Â
Her collage professor-Â No, just no.
Santana-Â They Didn't date, just had sex twice.
Biff-Â A rich douche bag who didn't even know the real her.
Puck once again- Because it worked out so well in the past, have fun with that.
I'd like to see Quinn be the strong independent feminist "who don't need no man" that I know she's capable of being. She's an amazing character who they've treated like crap.
They keep Putting her in crappy relationships, with the exception of SamÂ
She got pregnant at 16, possibly 15 because her birthday is  February 1st, 1994
She was kicked out of her house
Struggled with some intense depressionÂ
Got called "The devil I knocked up"Â
Got rejected by Shelbys glee club
Got in a car accident and was temporarily paralyzedÂ
Was nearly tackled out of her wheel chair by Finn just because she held herself up using the sink.
They should have given Quinn an awesome satisfying ending where she was single and happy with the prospect a being in a relationship in the future when she's a successful lawyer or something. She needs to stay the hell away from Lima and only associate with Rachel and Santana in NYC.