Why would a person act so strange when going to someone’s house?

I sometimes talk to this person on a dating app. They live pretty close by. One night I asked them if they wanted to come over and cuddle. At first they said no but later said “maybe for an hour or so.” They ended up coming over. They asked me to come outside when they got there. I gave them a hug and thanked them for coming over. They acted weird and just stood by their car for like a minute. My driveway was kind of icey and they said they didn’t want to walk on that. However they ended up coming in. We went to my bedroom and I asked them what they wanted to watch. I asked them if they wanted to cuddle. At first they acted like they didn’t want to get in the bed but eventually climbed in. They just buried their head in my chest and just looked down the entire time. We ended up making out a little bit which seemed to help them relax. They just looked and acted like something was bothering them and kept weirdly looking at their phone. I asked them to tell what was bothering them but they said they were fine. They seemed like they were going to cry or something. They stayed for like an hour or so. When I started falling asleep they took off and left. However, now they keep asking me what I’m doing this weekend. We are both 30.