1.No,I will not try to avoid him/her,because she/he is still the same person
2.No,I will not treat her/him as normal,I will be much softer
3.No,I will nott want to find out how he/she contracted the disease,if she/he wants to tell me,they will do it
4.Yes,I would feel better,because I will know that my friend hid nothing
