At first we started dating and he used to kiss my forehead and hands aand everything but the last time we were together he told me he didn't want anything serious and that this just fooling around and I'm cool with the idea so when I asked him if I can see other guys he told me that its OK and turned his face and I said thank you and kissed him and he turned his face again so three days later I text him and said:im bored and I want to play so what you say?
And he replied:iam very busy today and I don't have time to play.enjoy your time.
And I said:fine ill play alone today,but what you say we go out tomorrow?
And he didn't answer so why is he acting that way with me?
p.s.the last time we were together while we were laying and talking and he was looking in my eyes I noticed that his pupils were huge and the light was on so it want dark so I don't know.
How can I win him back when he won't even see me

You'll just have to ask him why he's treating you this way and how serious he is with you.

But when I asked him out he made up some excuse so how can we talk when he is avoididng me
And also what should I say if he does agree on seeing me without coming on too desperate

You already made the effort to look for him, now just wait for him to look for you. When he finds you, then confront him about it before going forward with him

There's no point to stay with a guy who doesn't treat you with respect and ignores you all the time

So if he doesn't look for you, then just find someone else to talk to

You can't win someone over that doesn't want to be won over.

He already expressed to you what he don't want at this moment so trying to push someone to be with you is just going stress you out and your only going cause yourself unwanted pain.

Listen to what a person say to you and don't try to change it.

He is avoiding you because he doesn't want to be with you so accept it and find someone that wants what you want. Because it isn't this guy.