I feel that you are describing the way my partner feels sometimes. We are in a great relationship in many ways but there are times when I have problems in the relationship and my partner will often feel compelled to walk on eggshells. I sometimes sense this and she will often tell me. It is linked to my bpd and self esteem problems. It is hard to admit to and makes for really hard work in our relationship but for us it is worth it. Please don't think I am making excuses for your partner. I think my relationship's survival depends on trying to be honest and working at it which hopefully works. Without that it must be really hard. I hope things get better for you soon.