need help understanding break up

we dated for 5 years, during this time my girlfriends depression got worse over time, a therapist also thought she might have bpd. she broke up with me twice before but only for a day both times the reasoning was that it just gotten too much for her. fast forward to 2026, she has alot of stress currently and started going to therapy. her depression also got way worse this year. we then had a conflict (not because of anything big) and she didnt talk to me for 2 weeks after that. when we met again she broke up with me, saying that she feels like our ways of having a conflict are too different and that she didnt miss me in those 2 weeks and doesnt love me anymore. she also said its gotten too much for her, having a relationship. i told her id love to work on our conflict problems together but she didnt want to, i wouldve given her some space to clear her mind but she also didnt want to. i also know for a fact that before our conflict everything was fine, she really did love me alot and was always interested in me and how my day went etc. so obviously this sudden "i dont love you anymore" reaaally hurt me. what do you guys think the reason was. is she emotionally exhausted in general at the moment and her depression is just too much right now? does she maybe really not love me even tho we were eachothers most important person? or is the bpd thing the therapist said also a factor? im really struggling with emptiness and not having fun doing anything since the break up. thanks for ur answers in advance