@SaltNburn666 As someone who is a Draco fan, I will say this.
Harry declined Draco's friendship offer because Draco tried to manipulate him just because he thought that Harry was a dark wizard because Lucius told Draco he was, there was indeed a long lasting feud between Lucius and Arthur, yes, and it's not Draco's fault that Lucius lied to him, but that doesn't make Draco's attempted manipulation okay, and since Harry declined Draco's friendship offer, yes, Draco did indeed, hate him. But that's not the only reason he hated him. Yes, Lucius is another the reason for Draco hating Harry, but Draco has more than two reasons for hating him.
As a Dramione fan saying this, Draco hated Harry for being friends with Hermione, a muggleborn, and Draco was raised to be a pureblood supremacist, one who is against Hermione and her people, although it's not Draco's fault he is one, however, this doesn't make Draco's bullying Harry and Hermione okay, and Harry is another reason for Draco's hating Hermione, because she's friends with Harry. And if the said muggleborn is Harry's friend, Draco will bully her even more.
Harry was friends with Ron Weasley, a blood traitor which some of Draco's family, like Bellatrix for example, consider to be "worse" than muggleborns. And as you and I pointed out, Lucius and Arthur have a feud going on so Draco's hatred of Ron grew even worse as Ron was both a blood-traitor and a Weasley, which also increases his hatred of Harry because he's Ron's best friend.
Draco is envious of Harry because of his fame, friendships, and the fact that he's better at flying than Draco, and Draco believed himself to be truly special, and he wanted to be more admired and it p***es him off that Harry is more admired at school than him, because in Draco's mind, Harry makes him feel like an outcast, and Crabbe and Goyle don't really count as Draco's friends since they're nothing more than pretty much his servants.
Harry Potter is a Gryffindor, and Draco Malfoy is a massive Slytherin fan and a Slytherin himself, and Gryffindor and Slytherin have had a long time rivalry, so this makes his relationship with Harry a lot worse.
Also, Draco used to fancy Voldemort, although this is more of Lucius's fault, Draco still chose Voldemort's side because he knew Voldemort wanted Harry dead, sure, he might've left Voldemort at the end, but that doesn't change everything bad he did to Harry in the past.
Whether Draco offered Harry friendship once or twice, it wasn't genuine at all, it was clear manipulation.
The obsessive behavior is another thing that's unhealthy.
Draco's obsession with Harry was his hatred of him, it was definitely hate, no love was ever hinted, Draco was obsessed with Hermione too, but there wasn't any love there either, I may be a Dramione shipper, but I've also seen the red flags in their relationship that need to be fixed, but there are much more red flags in Drarry than Dramione.
Not being rude, but from what you're describing, it sounds a lot like you're trying to romanticize the abuse going on in Draco and Harry's relationship
You can ship Drarry all you want, but Draco abused and bullied Harry, and that's Canon.
Please do me a favor, don't glorify abuse please, I've done so in the past with Dramione and it really bit me in the *** really, really hard to the point where I almost puked, I don't want to glorify abuse.
There's a big difference between Enemies-To-Lovers and Abuse.
Draco bullied and abused Harry, and his obsession with him was hatred, nothing more.
He never had any romantic feelings for Harry, and if he did, it was probably lust, there's also a difference between crushes and lust. And lust is never okay, ever. It's creepy and weird. So please, for the love of God, don't glorify lust or abuse.