My boyfriend has kids and I feel left out.

Ba
I'm very confused with my relationship progress at the moment. My man has 3 kids by 2 different women and was in an 8 year relationship and married for 5 of those years. He's 11 years older than me and shows me that he loves and cares for me very much. I'm just beginning my life and although I love him I tend to feel very left out and jealous of his family. I'm not sure if this is healthy and if I should stick it out or if I should move on to someone who is free of attachment just like myself. Although it is not what I feel like I want. Deep down inside I feel hurt when his kids mothers call him just to talk about their kids or just to blow some steam off about their day. Has anyone else experienced emotions similar to mine?