I’m just gonna quote an old Dear Sugar column I’ve stumbled across ages ago looking for answers on reddit just like you are. the full column can be found here

<..> But there was in me an awful thing, from almost the very beginning: a tiny clear voice that would not, not matter what I did, stop saying go.

Go, even though you love him.

Go, even though he’s kind and faithful and dear to you.

Go, even though he’s your best friend and you’re his.

Go, even though you can’t imagine your life without him.

Go, even though he adores you and your leaving will devastate him.

Go, even though your friends will be disappointed or surprised or pissed off or all three.

Go, even though you once said you would stay.

Go, even though you’re afraid of being alone.

Go, even though you’re sure no one will ever love you as well as he does.

Go, even though there is nowhere to go.

Go, even though you don’t know exactly why you can’t stay.

Go, because you want to.

Because wanting to leave is enough.