I recently discovered that my boyfriend of 18 months was still in a long term relationship when we got together. So there were months of overlap. I found out by accident and so now he has told me it finished in a terrible way and he was very cruel to his ex. He lied to me about being in a relationship and about when it ended. I feel I’ve been living a lie for all this time. I have ended it but feel unsure if I’ve done the right thing now