When it comes to getting along with people, I have a simple rule:

First, I bring goodwill to the table—I’m willing to spend time to help you.
Then I observe: when I run into something, will you reach out too? When a good opportunity comes, will you remember me?
If you’re also a trustworthy person, then we can support each other and maintain a long-term relationship.
If I help you, but you just keep taking and you don’t know how to be grateful, then it means I bet on the wrong person—cut the losses. I won’t help you anymore going forward.
If I help you, and you’re not grateful, yet you badmouth me behind my back to mess with my mindset, then it’s even simpler: block, cut ties, and retaliate if necessary.
Conclusion:
First, release goodwill and give cooperation a chance; if it’s mutual, deepen it; if it isn’t, walk away; betrayal calls for a counterattack.