Il try to cut a long story short...I believed I was in a good relationship...5 years...2 children...No cheating or lies (To my knowledge) on both parts...Very social couple...Very happy family...Basically the other week.We are out & a woman says hello to him...I ask who she is and his face whitens and he tells me she is a worker who done a few jobs at his new job he started 3 months ago (He works in the building trade,not the most female friendly environment) I dig and dig about this as to why he has never mentioned her...And he said she worked on a separate job in a differant building.He thought I would be funny about it.So he never mentioned it.He never spoke to her.Or had anything to do with her and she no longer works there...(Hands up I am a bit of an insecure girlfriend.I have in the past gave him a hard time over girls from his past.And been jealous at times,so I kind of understood why he would lie & I felt quite guilty that my low self esteem has made my partner have to lie about something so normal) But my gut just didnt sit right with it still...I looked her up on social media...and shes everything he likes in a woman.Blonde tattoos nose ring!And it made me horrendously jelous & I kept on grilling him...I said I was going to message her & find out from her what has been going on.Why would he lie about her if he never had anything to do with her?...So between then & now.He has drip fed me more and more info...We went from.Ok I said hello to her a few times.But that's it.To ok I worked with her for 3 days on the same job.But never talked to her & we were never alone & we are now to the point that he did work with her for 3 days solid.One day he worked with her alone.And they have had conversations.And she asked him where he got his tattoos done & he asked her about hers (Tattoos are a big turn on for him) So I'm absolutely gutted...I've just had a baby.And I was pregnant when he was working with her so I feel I was at my most unattractive when he was round her.I know its not cheating.I know its normal and healthy for men & women to work together.Talk to eachother...As much as I have low self esteem and worry the first woman he speaks to he will want to ditch me for.I wouldnt ever stop him.Or control him.Maybe sublimenly I have...By being so insecure maybe he didnt want to upset me by me knowing he is with a woman every day.Maybe this is my fault?It was 5 days after giving birth that we bumped into this girl.And I've been in pieces ever since.I cant eat.I keep crying.And i just have this pit of the stomach pain that he wanted her.Why would he hide her?Why did he want to talk to her about her tattoos...Fair enough if they were chatty and being normal "freindly" people...Why not talk about their kids aswell?That's something they both have in common?But no...And he never mentioned me to her?...What must his intentions of been...How do i go forward from this?Hes so sorry.Hes been crying.His freinds from work have been "backing him up" his boss has too...Ive been threatening to leave him.I feel like the trust has now gone.I have very little trust in men anyway.Ive had bad previous relationships and he knows this.He knows if he was to lie I would put 2&2 and make 10...But he did it anyway...I'm being a psycho arent I?...I feel like all of this is my fault.