Feeling so lost

I meet the most amazing lady who was so honest about having bipolar right from the start. Sure I noticed some things from time to time. Like how she could start yelling at any point and sometimes I thought it might be overreacting but the yelling was never at me or about me and it was how the rest of her family seemed to communicate. Over the year she became my best friend and I thought she was my soulmate and I had finally found her. We connected and could laugh and be happy from morning to night.

every now and again she would ask for space to clear her head which I was ok with

we started planning on moving in together and everything was going great. Christmas and new year was great she even said they were the best days of her life.

I knew she was struggling at work because of work load and covid and a new building that work had moved to and I know she has ocd issues with things having to be in the same spot.

the 2 weeks into the year she has nightmares and she cannot even go to work, she went to the doctor who may of changed her meds, I am not sure I collected some script for her but things then happened so quick.

the nightmare she had were about a person she knew over 20 years ago and she doesn’t even know where they live, but within 3 days she had tracked him down and travelled 4 hours to meet him and spent the night with him.

it doesn’t bother me than he is male and they shared a room because I trust her and the absolute terror on her face when she had the nightmares was something I hadn’t seen before

upon her return she told me he had invited her to go up to his home another time.

Then she took her kids on a prearranged 3 days holiday which they had a great time

then when they got home the second night she said I love you but I am not in love with you and if I would like to leave. Well I didn’t see it coming and I said I would like to stay the night and then she said would you like to finish watching a tv show we enjoyed together.

since then she has given all my stuff back, said that she just wants to be friends, hasn’t even let me say goodbye to the kids who I got to know really well and know she ignores my texts.

since the break up I thought it might be an episode but her family and friends say it’s not and I don’t know what to do.

i don’t want to walk away from her if it is an episode because she has had a shit life, her sister died when they were young and according to her friend she has a new boyfriend every 6-12 months

she was so honest about bipolar to me that I don’t want to let her down if it is a mental health.

I am just lost she was my best friend and now she won’t even acknowledge me

but when I have talked to her she is smiling and so super confident in life , which I saw at times during our relationship but I also know she can get depressed quickly but change to a happy state just as quick

i am so lost and hurting

do I walk away or not (I still love her so much)