Thankyou, thats so sweet.
I'm really sorry to hear about your friend. I lost a friend to suicide, and several people online as well. If you ever want to talk (Not to throw it in your face, but just that I can sympathise.) please know you can always message me.
Its quite natural to be cautious, and I do hope you're not feeling bad because of that. I think at times even specialists are worried by some of the people they come in contact with. I agree with SOLOisMeredithGrey as well - sometimes its the person you are cautious off, and the condition is just a feeder of this.
You can be cautious without being rude - not that I can imagine you being so.
I know its not exactly the same, but a friend of DPs has a drug problem, and because of this is violent at times (He has actually stabbed my DP in the thigh, although this happened before we were together) as well as just being all together a bit "out of it", if you understand me. I've put my foot down, before the baby is even born, and said I do not want this person having ANY contact with my child. He's actually okay, quite funny and caring, but theres the other side to him that scares me, and makes me scared for my child. You're just looking out for yourself and your child.
I hope you've had a good day