i can't figure him out help

Hi all.
I about 8 months ago became friends with a guy,artist, via net, we became really good friends we shared alot i really liked him.
he told me from the first he's the type of person who doesn't ask what he wants. he's afraid what others may say.
and he said he isn't good at relationships because he treats girls like boys and i said i have no problem with that.i don't like girlish stuff anyways.

anyways before we met eachother i said maybe i can ask him out and he said no he doesn't want a relationship.he's just not ready and doesn't have the energy.

also he said he has never been in love.

we met a couple of times it was really good, he actually gave me some really cool stuff and bought me cute things.

we talked practically every day for some hours.
at first it wasn't that obvious he wouldn't mind but he wouldn't let me say i miss him .he said he wants to suppress his feelings.no answer to why.

but after a while he just said he doesn't feel right and he didn't talk to me much.I knew he used Fluvoxamine 100 and mostly haloperidol but i never asked what for.
anyway i about read depression and bipolar,and thought its just an episode and i was supportive and just asked him every once in a while to see eachother that he refused.

after awhile he got better he was more social but he added some girls just to flirt and i got sad and i told him about it.he said hes not ready and it shouldn't stop him from having sex..but nothing will happen.

and after he said if he wants any relationship it will be with me.that was a month ago.

some weeks after he got worse,avoided me, it was like he's adding any b**** and just wants to make me sad...i told him and i got sad and he said he doesn't like to give any explanation to anybody ,talked very mean.

i said i don't want any but its just makes me sad because i like him more than friends.and he said sorry he has changed his mind and he prefers bad and slutty girls now.and he doesn't want to date me nor see me again there's no point in seeing.we don't match.and he doesn't want to let anyone get close to him.

anyway it broke my heart he said we can be cyber friends and with no talking about emotions but i couldn't do it.
it seems that now he isn't flirting that much anymore...

is there any mental disease that a person will act like this?didn't he like me or just changed his mind?
he mentioned sth about bipolar but he said its just what he thinks he may have.but the drugs were prescribed for sth i didn't ask what.