Perhaps a question is How to end it?
If you are out somewhere together, each with your own transport, you can literally get up and walk away, preferably stating a reason.
If you have gone out together in one car, you can make a comment at the end of the journey, if things have been bad.
If you make contact by text or email, you can not answer, or say you are not free. Or reply stating why you don’t want to spend time together.
If she rings you can not pick up.
If she leaves you to make the next arrangements, just don’t bother.
I see my local friends at church or choir or similar. We rarely take it beyond that. Others, more distant, well we just pick up where we left off and get on really well, but it is usually up to me to make contact. Now I am wondering whether to make the effort. It can be a minefield.