Should his disease be an excuse?

So, 18 and pregnant here. Completely out of the blue, but this lil one decided to pop up when financial troubles hit their mom and dad, hard. We've been trying with what we have, and have made progress - but my pregnancy has also put me out of work because of how bad it's hitting me.

Anyways enough of the back story. I have a best friend I call my big brother; he is also best friends with my fiance. He was promised godparent status, and while this is earlier than expected, he has been granted it as well.

But the one thing I hate: he is schizophrenic. I don't hate that he has this, but I can't help but hate him sometimes. He's one of those people that swear up and down that "therapists are shams" and that "meds don't do anything", and nothing can convince him otherwise. And when he's normal him, he's a sweet, caring, dorky "brother".

However, the downsides are VERY down. I have been called a slut, statistic and disappointment for my teen pregnancy. I've been told "congrats on ruining the kids life" and have had blatant whore jokes thrown my way. But when he calms down from a rage, he begs for forgiveness and says that he doesn't mean a thing.

As a sufferer of bipolar, I can and can't understand where he's coming from. And the pregnancy hormones have just riddled my feelings anyways. However I am a firm believer that your disease doesn't make you say things you don't mean, but expose the deeper thoughts. So ladies (And occasional gentleman), am I wrong for not forgiving him?

I just need someone with a clearer head to help me out lol