Bit of background, been with OH 5 years and have a 18 month old DD. I have always been 100% loyal to OH, but we have faced a few rough patches due to him being unloyal. First occasion we was at breaking point in our relationship, it was around 2 years in and he met and slept with a girl he met at a train station three times. Second occasion was when I was pregnant, he was unsure about going ahead with the pregnancy and left me at 20 weeks and started seeing a co worker for around a month. Swears that nothing happened other than a few kisses as they only ever spent time together at work and on lunch breaks. This seemed to hurt more as I was carrying his child.
Anyway I'll stop babbling. Ever since DD was born he has been great, such an amazing dad I can't fault him one bit. I didn't find out that he had cheated on me until I was 20 weeks pregnant, But because I was so far along in my pregnancy I just felt as if I had started a family with the wrong person and it broke me. Now I feel like I'm just stuck. I love him but I don't feel like I'm in love with him. I don't know if it's just because of how much he hurt me and I've just never fully got over it. But now we have Dd in the equation I feel as if I have to be with him for the sake of her. I always planned to have a perfect loved up family and I don't want to take that away from her 
I started a new job a few months ago and I've started to feel feelings for a coworker. It's not even a massive physical attraction, he just makes me laugh so much and I haven't laughed like he makes me in a while. I didn't see him and just immediately fancy him, its just kind of developed. Ive not acted upon anything and my coworker isn't even aware. I would never be unloyal. It's just a crush I think, it will probably pass.. but surely if I'm feeling attracted to someone else then I can't be happy. I just don't know what to do, i know for a fact if I hadn't of been pregnant I would of walked there and then after finding out but now I just feel trapped and don't want to break up our family. We live in a home together and I couldn't afford it alone and couldn't afford my own place either. I feel like such a bad person