Search Results: going down on eachother

I work with someone. We worked together for a good 4-5 months. We never spoke to eachother until recently. First time I met him - he just stared at me. Other times, I've heard rumors that he tried hooking up with girls in the office. Often asking them to hang out outside of work. He is also a friend of a slim ball coworker as well. Which makes me question his character. He would sometimes say hi to me but sometimes won't. He's always the one initiating saying hi- I never say hi because I feel like there's something off about him sometimes. One time he came by my desk and tried to get to know me. We even matched outfits at work for fun.
However, yesterday he really tried talking to me. He would come by me and say hi - try to get me in the group conversation. So I decided to sit down and get to know this guy. He seems nice. What is shocking is that we are very similar. Both moved out young, want to go to the same state, both studied art, etc. I didn't think there was someone similar to me before. He also lives alone with two pets... i live alone with two pets. He asked me if I was going to move out of state alone- I said yes. We talked about fashion and what not- he's interested in that as well.
So I told him we should talk more- we are very similar. When our shift end- he came all the way by me again to say good bye and asked if he will see me tomorrow. So we see eachother today. I normally pass him when I walk in my job - however I took an alternate route. In the back of my head I knew he would come by my desk to see if I even came into work. Sure enough- out of the corner of my eye- I see him pass by my desk and hurried back to his. Today he didn't really talk to me though. He didn't say hi and he ignored me. I held the door open and all he did was smile and thats it. I asked him if he was tired- he said yes. Then after that we just stopped communicating. I'm not sure what is going on... Is this just friendliness? Because I'm feeling a total different vibe.