Why does he only see me as a friends with benefits?

Guy only wants to be friends with benefits (and doesn’t want to be seen in public with me) but he is courting and going on dates, trips (out of state and international), galas with this other woman for almost a year. They also hang out with each other’s friends.

We have mutual friends (I’m friends with his closest friends) and he doesn’t want them knowing that we’ve been seeing each other.

He was at first hesitant to hang out with me in public and on the rare occasions that we do hang out, 1) we are only out for 10-15 minutes, 2) in secluded places, and 3) he looks nervous, fidgety, and he’s looking around everywhere.

Whenever he gets a phone call, he goes into the other room or downstairs.

One night, I spent the night, he got a phone call, he went down stairs, I fell asleep, he got back in bed and his hands were cold, then in the morning he explained that “someone” had a flat tire and said that he was downstairs the entire time and was lying on his couch because the alcohol made him dizzy

Then the next night when I stayed over, he instructed me to park across the street from his neighborhood. He said the reason why because he had an oil spot in his other parking spot that he was covering up with his car. There were other empty parking spaces in his neighborhood.

I’m hurt that he only sees me as a friends with benefits. We’ve only been seeing each other for a month and I’m considering ending things. I’m constantly wondering, what this other woman has that I don’t and why he doesn’t see me as girlfriend material.
Why does he only see me as a friends with benefits?
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