Is a 20 year old not allowed to make decisions on who they are sexually or romantically attracted to?
To be fair, is that a decision anyone can make? That is, we can’t usually control whether or not we’re attracted to someone.
But to your point, yeah, what consenting adults do should be nobody else’s business. We can acknowledge that we wouldn’t personally want such a relationship for ourselves without taking away others’ autonomy.
As to OP, it sounds like they personally didn’t want the relationship, in which case it doesn’t matter how bad the 18 year old wanted it. Nobody’s obligated to take part in a romantic/sexual relationship they don’t want to have, no matter how desperate the other party is for it.
To be fair, is that a decision anyone can make? That is, we can’t usually control whether or not we’re attracted to someone.
But to your point, yeah, what consenting adults do should be nobody else’s business. We can acknowledge that we wouldn’t personally want such a relationship for ourselves without taking away others’ autonomy.
As to OP, it sounds like they personally didn’t want the relationship, in which case it doesn’t matter how bad the 18 year old wanted it. Nobody’s obligated to take part in a romantic/sexual relationship they don’t want to have, no matter how desperate the other party is for it.