Sry its long but I'm so sad and confused someone please help me out

I’m so confused I’ve been seeing this guy for 3 weeks straight.. Like he came over everynight or in the morning before work. Everything was going great I could feel he liked me a lot even though we don’t know eachother for long..we never made it official that we’re girlfriend and boyfriend but he told me a few times he wants to be with me. I trusted him..but now all of a sudden I feel like he’s drifting away he doesn’t text as much anymore he use to text me everyday more than once through the day…now I had to text him because he hasn’t in 3 days…I didnt talk to him for 4 days just text…and I’m used to seeing him everyday…n he didnt mention he misses me or anything and I miss him a lot..he did say he wanted to come over but he’s broke and can’t take the bus…we live in a big city…anyways today I saw on his profile a girl said come see me with a smiley face.im really sad and confused now…because when we first met he asked me if I’m seeing anyone because he isnt..and that he wants to be with me. Do you think he’s seeing another girl?he did just start working 2 jobs but he would always come over late straight from work…I dont know what to say to him I want to know if were boyfriend and girlfriend and if he’s been with any other girls since he met me.. Do you think he lost interest in me so fast when I used to feel how much he liked/cared for me?how should I talk to him about this?like what questions should I ask?sorry its really long but I’m so sad and confused because I don’t wanna lose him :( ps he did say yesterday he’s really stressed out but I feel like I’m the only one showing interest now..in always sending him a text first for like the whole week