Polygamy

I am a 29 years old, unmarried, looking for a partner. I am struggling to find someone compatible. However today I was driving home at night and saw an ex-boyfriend of mine who is now married walking to mosque with his son. I offered him a ride to mosque and we ended up talking for some time. He asked why I broke up with him and admitted that he still cared for me. I made a joke out of it. Later on I asked him if he could find me a husband, he said he could not but he asked how I felt about being a second wife. My reply was no because I feel I am too jealous. However, I remember watching one of sister aaminas videos where she said that polygamy is actually a gift to the women. I was wondering if you could please explain this to me as I feel if I understood it better I might be more open to it.