Relationship

Im a teen.
much like every teen, Im in a relationship.
Mines falling apart though.
My person won't commit to me.
The cheat, they flirt, they have so many red flags!

Why do I stay with them?
For once in my life I feel like I belong and I'm actually likable. 
I've gone years thinking I'm gonna be alone and never have anyone.
But now I have someone, and I don't wanna let them go.

I've been told by so many people I should break up with them, and I haven't yet.
I don't know what to do anymore.

To be honest I wanna be with them forever, but that's probably not gonna happen at this current rate.
I love them so much, and I don't know what to do with this relationship.

Do I stay with them? Or break up with them?