Why did Lilly marry James if Snape was her true love?

she didn't see what she had the entire time & Sev calling her a 'mudblood' didn't help the situation it angers me as well that she fell for a bully

Lily and Severus were only ever friends in school and although I believe their friendship would have grown into love given time, snape's love of the dark arts and calling lily a mudblood ended their relationship. If Snape had turned away from the dark arts and told lily how he felt they'd have got together. However, lily then found love in James, for whatever reason. Perhaps she would have been happier with Snape but unfortunately she married James. Although James was a bully once he grew up he was a brave man who died protecting lily and his son. And also he wasnt involved or even tempted by the dark arts, that was a big thing for lily I think

He wasn't. He loved her, but he called Lily a Mudblood and got involved in the Dark Arts. She stopped being even friends with Severus, started going out with James in seventh year, and fell in love with James. Then they got married and had Harry.

Okay one Lily never said Severus was her true love they were just best friends until Severus called her a Mudblood. Two James did not put her under any curses she decided to date and marry James of her own free will. Three James gave up his life to save his son Harry and his WIFE Lily!!! What gets me mad is that people are to arrogant or Stubborn to see that they loved each other!!! I am not trying to hate on SnapexLily I am just saying that James did in fact love lily also and she loved him.

She never said Sev was her true love. They were friends. I feel sorry for Severus but he fell in love in an unrequited manner. But she never promised him anything as far as feelings were concerned.

Maybe he would have, with patience, the abandon of the Dark Arts and his dubious friends, and above all the prejudices he never truly had, made her love him, we don't know. We'll never know.

Maybe Severus was too deeply in the Dark Arts. It´s the same like to love an adicted one or a sectarian. This is the only explanation I can find.

J.K Rowling says that Lily could've loved him back if he hadn't become involved in the Dark Arts...
I think that if Snape had told her how he felt/not called her a mudblood they would've been together.

En verdad no lo se, ¡Hacen una pareja tan bonita! Pero bueno, ella se lo perdió y ahora Severus es mio y me casaré con él... Bueno no, Siempre apoyaré el SNILY...
ALWAYS!

Snape's love for Lily was an obsessive love that was only one sided. While James WAS an arrogant, attention-seeking, bullying, toerag, he had to have eventually changed. Lily was a bright witch, and many people have said that about her before, she would have never dated James until he had matured and stopped bullying people. Snape did not truly care for Lily, it was an obsessive kind of love, and if he truly loved her would have asked Voldemort to save Lily's whole family (Including James and Harry), instead of just asking to save her. He would have tried to save the people she loved most. His love for her was selfish. He never protected Harry out of pure nobility, he protected him because he did not want Lily's death to go to waste. If he had managed to convince Voldemort to save Lily, just her, she would have been disgusted at the fact that Snape tore her away from her family, while she could have protected Harry. He would have selfishly expected her to love him and be forever grateful, even though he could have tried to save Harry and James. I believe another example of how Snape and Lily are not "true lovers" is that his patronus is a doe, exactly like hers, while James patronus is a stag, which compliments a doe and is made to be with a doe. Lily never chose James over Snape. She ended a good friendship gone wrong with Snape, and later chose to go out with James after he matured and stopped bullying people so much. Lily was anything but stupid, and Snape and her never had a true love.

Snape and James were enemies is school. All we see of the memories is James abusing snape but they were more likely than not equals that both bullied each other. Neither was truly the victim. Also, snape never admitted his feelings to Lily, so there's no reason why she shouldn't of been with someone else if she didn't know. Not only that, but James wasn't a horrible person. People seem to forget that he decided in his SECOND YEAR to become an Animagi to help his friend out. He also took Sirius in when he was kicked out, and sacrificed himself so Lily and Harry could live. He was arrogant at first but became a remarkable person in the end. He didn't dabble in the dark arts like Snape, just played jokes on people. What the Death Eaters would do would be unnessessarily cruel. Yes, Snaoe loved Lily, and yes, his Patronus matched hers, but James and Lily's Patronuses were soulmates (doe and stag). Snape and Lily's Patronuses are only one sided, where Snape loved Lily but she didn't. In the end, with the paths Snape
chose, he and Lily were NOT meant to be together.