Hello there. Welcome to the forum. I reaed your introductory post, and saw that you are also close by, in Wales [I'm just over in England, so hi, neighbour!].
I thought your story seemed rather upsetting, but with the more happy point of you figuring out that it's quite alright to love many. =]
I went through similar points, early on in understanding my own poly. Where people couldn't understand it, but I came to just take it as who I am. I hope you find all the support from everyone here encouraging, and helpful. I've certainly felt at home with many of the regulars here. =]