Help me understand this guy?

The guy often tells me he is alone. He often vents to me and tells me of his anxieties, fear, depressions. and we have these sessions where he tells me his concerns of his parents, his fears and him advising on my health issues.

I sort of notice he may be emotionally dependent on me and i dont know what to feel about it. He also said im the only one who can relate to him due to us both having traumas

Am i wrong to fear this? He once rejected me in the past but how come he keeps running to me when he is sad, depressed, alone or have anxieties? Why can't he just go elsewhere?

Now he told me he is coming back to my city, its also where his parents are as he originally comes from here and tells me he'll have a trial and if everything goes well settle here for good.

I felt like i've subscribed to something which i didn't press a button on or maybe i did?

For those who may judge my worry, i have every bit to do so since this guy in the past rejected me and the past months kept on complaining he is alone, depressed and everything else. And tells me im the only one who understands or listens.

I've had friends in the past but this one is like an emotional support of an SO minus the commitment and everything else.

Help me understand this guy?
Post Opinion