Seriously, I have to write this all out again?
First, read the ep 4 library scene again
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Try to put yourself in the MC's shoes. Do you think that he might have thought that there was a possibility of a relationship here?
Yes, because even though it was all happening in a very short space of time, their feelings deepened for each other as was evident from the fact that, in that scene with Maya in Ep 3, she showed a determination to give herself over to her feelings for him and was preparing to tell him everything, as well as perhaps that she wanted to be with him, before Josy showed up. Josy similarly was prepared to dump Maya and be with the MC when she got to the college, so they were both going to make massive leaps for him.
What happened between then and Ep 4 was that they spent 2 days together and it reminded them of what they had which made things even more confusing and complicated for both of them. Maya also now had a chance to enact her plan to get the tuition, get out from under her Dad's thumb, and be with Josy, but she now had feelings for the MC. The MC may have started out as her "way to escape", but he's more than that now and she knows it, as does the MC.
The problem, as I will always continue to say, is that the rejection doesn't make sense, but so too does them getting back together so easily and even having that reconciliatory kiss. I do think they can forgive each other for being with the MC because they both feel the same way about him (I even think Josy should be ecstatic about it), but I don't think they should have made up so easily. They also shouldn't have rejected the MC because if he's done everything with them, as some people on the DIK path had done, then there'e nothing they've seen that should make them wary of being with him.
Josy did tell MC that she had someone else. He then did the right thing and told her this is farewell. But Josy insisted that it was not farewell, only good bye while crying and hugging him. Don't you think she was sending him mixed signal's here? Don't you think she was holding out the possibility that there could still be something between them?
She's a woman, of course she was giving him mixed signals.
The situation is pretty clear, and both girl's admit it, that they used the MC as an emotional crutch at a time when they were both sad and lonely. How would you feel in that situation?
I wouldn't say they used him, they leaned on him for emotional support during a difficult time, and given this game's rapid progression of things, they developed feelings for him quickly so it became something more.