Don't stay in this if you are mono, struggle with self worth and have a lot of past stuff to get through. Really. Mono/poly relationships are tricky to begin with for people with great self esteem. They can destroy people who don't. I seriously would be considering getting out and finding someone that is similar to me so as to work together on some of this stuff and NOT date others. Unless your partner is willing to work with you and not date or take on lovers for a VERY long time and until you have worked on yourself. Therapy sounds like a plan don't you think?
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