i have this same fear. easier said than done but i think to some extent you just have to accept the risk. a lot of relationships and friendships, especially with neurotypicals end up fizzling out after a while. it's painful but for me, I just had to choose to enjoy what i had in that moment and see that that feeling outweighs the pain that might come in the future. I realize i sound like a total n*rmie but i don't have any better advice. I avoid romantic relationships altogether because I'm scared but friendships are easier because you're not as attached to the person, there's less risk of becoming dependent on them.