Not sure if he [27m] is just keeping me [23f] around for the sex until something better comes along.

We've been 'dating' for about a month and a half. We had the talk about how I wanted something other than sex (we had sex sooner than I had wanted, due to me letting go of my inhibitions), and he agreed with me that he was also looking for a relationship and thought I was really cool and is willing to see where it would go.

We haven't talked about that since, and have gone a good amount of dates and parties. At one party, though, I saw him going downstairs with a chic and I talked myself out of following them, then into following them, just to find them hanging out with a bunch of other people. When we got home I asked who she was, he said he met her at a party the week before and were just talking. He asked if I was jealous and said that 'we're not even technically dating yet. How are we supposed to start if you can't even trust me right now?'

He contacts me daily. We hung out last night, went to dinner. The whole time, though, he seemed really distracted/distant. He doesn't seem so into me that he wants to know about me as a person, my past, my goals, etc. I don't know if that's just how he is, and we have to hang out longer and get to know each other more, or if he is just really not interested in me, and knows I don't want it to be just about sex, so he is taking me on dates to keep me happy.

I just don't want it to be like this. I either want to know that he is not seeing other chics, or that he just wants sex with me.

TL;DR New guy I'm dating for about a month now, says he wants a relationship but acted very distant and disinterested when we hung out last night, didn't even kiss me until we went to bed. Don't know if he was just not in the mood or if he's lost interest.