My husband has bipolar disorder, I don't know if it is type 1 or type 2. He won't take mood stabilizers, but takes risperadone and effexor. I went on zoloft around the same time. Why? Well, usually our moods conflict, when I'm up, he's down and when he's up I'm down and this is a good balance, but when we're both down, that can be very dangerous as we've learned in the past, so meds were needed when we were both becoming depressed. I think that's what you need to watch out for. Feeding off of each other's mood to the point where your life might spin out of control. Also, I think if you're not so understanding, it's really annoying when you're wanting sex lots and your partner is depressed and doesn't want any ever. Both my husband and I have been on both sides of that story and while it's not fun, we both have the ability to put ourselves in the other's shoes. Got to avoid being self-centred in any relationship, but when you throw stupid moods into the mix, it might be more important.