<human>: Summarize the given text in a few sentences.

I recently started going on dates with a very sweet girl that I met online.  She is positive, upbeat, and quite fun to be around.  After our 4th date I ended up spending the night at her place.  We had been drinking and ended up having sex, which was mediocre at best.  I chalked it up to being buzzed and moved on, still excited to see her soon after.

We hung out a few more times, and the last time (Thursday) I spent the night again.  The sex was a little better, but I just don't think we are compatible in that regard and it has completely shut off any interest I previously had in pursuing a long term relationship with her.  I wish I had some kind of control over the way I felt, but it seems it just is what it is.

I did a search on this topic but didn't find too much that helped me.  I just want to take the highest road possible because I never want to hurt anyone's feelings, especially someone as nice as her.  I know I have to be honest with her, but how would r/relationships handle this?  The way I see it (before reading your responses) is I have two options: 1) Make it quick and send her a text explaining that I don't see us developing into anything long term and that I don't want to waste her time.  2) Ask to meet her again and tell her the same thing in person.

I could use some advice on the wording as well.  There's no need to tell her why, in my opinion.  We have only been seeing each other for about a month, for what it's worth, but the sex part makes me feel a little more like a douche for having to do this.
<bot>: Went on 6 or 7 dates with a really nice girl, but realized I didn't want anything long term with her.  We have already had sex twice and I would like some advice on breaking it off in a respectful manner.