Devastated

I met someone online at a dating site called Dating4Disabled. He has bipolar disorder also. I thought we were getting along really well, falling for each other really. Then suddenly about 2 days ago he quit calling me. I called and left messages for him, I emailed him...nothing. He was the first person I could be myself with and I'm devastated that he has decided to cut communications with me without telling me what is wrong.

You don't mention if you too suffer from BP. All I can say is that before was dx'd with BP, I too dated someone who suffered from BP. It was intense and a real roller coaster. One never knew where one stood, and the other person's emotions would change from one day to the nex.t If your new friend has withdrawn, he is in all likelihood suffering from depression.
I would suggest you google and educate yourself as much as possible about BP and try understand what it truely is that a person experiences during BP.
Give him some room for now, and if it truely was meant to be, he'll be back once he feels better. Please don't take it personally. Suffering from BP, one often just needs to take a step back and isolate oneself from reality in order to just get through the really bad days.

Maybe sms or e-mail him, saying that you are there to support him if he needs to talk. Then you need to just be patient.
I so sorry you are going through this.

Sorry - I just re-read your post. You also suffer from BP.

Well, I've been there; a relationship between 2 BP people and it really is not easy. Your cycles tend to run very different and therefore your needs are constantly changing. You may not be in a position to offer him what he needs right now, or he may be going through a manic phase, having little regard for anything or anyone.

Give him space. Maybe therapy for the two of you will be beneficial. Communication is crucial in any relationship, but even more so when BP is involved, so you need to constantly be aware of where in the cycle wither of you are. You need to lie down boundaries and rules as to how to handle each of your cycles and the various episodes.
It's going to take a lot of work, but a relationship is usually worth it.

Again I stress - don't take it personally; just offer as much support as possible, being careful not to make him feel claustrophobic.

It's very possible that something happened that has made him unable to contact you. He might have cycled and had to be hospitalized, or he might have had to attend to a family emergency, or any number of other things. I hope that you here from him soon!!