Are you a second wife?

Dies he have children with his ex? Do you get along with them? How do you feel about it.
​I am married and my husband was previously married and has 2 kids 7 and 2 years. I love him do much and I thought I will get over this with time. I am still struggling a lot, I have a lot of jelousy for both the ex and the kids. We are now expecting our baby together. The ex is extremely friendly with him and send him pictures and videos if the children everyday and that relation drives me nuts. How could I make this feeling go away? I don't want to be in defense all the time nor ruing my marriage. I am 25 without previous kids or commitments