I am a monogamous (By choice, my partner has told me I can be poly if I want to be) wheelchair user and met my first and current partner about a year ago who is polyamorous. We fell for each other very quickly and I was fine with her being polyamorous the first time around (It wasn't a sexual thing like cucking, it was just she made me happy and I wanted her to be happy too). However not long into our relationship she had to move away for work and we broke up after trying long distance.

She has since moved back locally and wanted to get back together. I have been very conflicted this time because of the fact she broke up with me the first time. I still love her but had my confidence absolutely destroyed by both the first breakup (because in my head I wasn't enough for her even when she was allowed to see other people (I know that's not how polyamory works but it's how I'm feeling)) as well as the fact no other women have given me any real interest. But I still have feelings for her.

We have restarted our relationship and she is going to be trying to help me feel more comfortable with her being poly again. However I would like some things I could also work on with myself to feel more comfortable with her polyamory. What advice can you give me to get over it this time? Is there anything we could try to help me feel more confident/ comfortable? I think the thing that's making it so much harder for me is that I used to be fine with it, it wasn't a thing that ever crossed my mind as a negative. I just wanted her to be happy. And this time I am feeling uncomfortable with it and jealous/ selfish which I know isn't right. I really want this to work out but I know I need to change to get back to how we used to be

TLDR: I (20m) am struggling with my partner (23f) being polyamorous because she broke up with me after having to move away but she has since come back and we have restarted our relationship. I have now got massive confidence issues and want this to work out but don't like the how I am now bothered by her being polyamorous. What can we do to help me get over it/ feel more comfortable with it? Is there anything I could work on in myself to help the situation? Is there any other general advice you can give for the situation?