What should i do?

I'm 26 and I am dating a 44 year old. We get along for the most part and I love him very much but i seen he had a kik and that he had talked to a few women on there. I then went through his contacts and seen round 7 different women names. One of which was his ex. I was very upset by this but he said they was only friends and he would never cheat. He did delete the kik and the contacts but I'm worried he still talks to them. Also he won't tell anyone family or friends that he has a gf and that I live with him. I'm scared it will give women opportunity to hit on him. He says his personal life is no ones business. He is on the road a lot and I'm home worrying. Ugh!!