Self esteem issues

I don't know why, but I feel so down about myself. It started during my pregnancy when my husband started to seem distant from me (physically) which, OK I can understand, but what hurt me was that he started talking about his high school crush on an actress, looking at a dancer on you tube wearing revealing clothes with her bits sticking out, and he did this in front of me, he ignored me, how I felt. I was already feeling frumpy being pregnant.

Then there were the arguments about people he worked with, I was left feeling like although he cared for me, I wasn't the attractive girl he once fell in love with.

After having my baby, although things are back to normal, I still feel hurt, I feel jealous all the time when my husband even mentions another woman e.g from work. I cant be bothered about myself... I feel my husband still doesn't notice me so what's the point.

Why do I ask for constant reassurance from him about myself?? Why do I feel jealous all the time? Why cant I just get on with my life and stop envying others?