Long distance help!

So me and my boyfriend are expecting baby number one. He just left today to go to school so he will only be able to visit when possible and on his breaks and when the baby is born he will be here hopefully. I’m happy he is leaving to better himself but we have never been so far away from each other and especially with the baby it will be difficult. We have talked a lot about what our plans are and we have a lot of trust in each other...for the most part. I trust him with everything in me but he’s really insecure and thinks I’m to good for him and is worried that I will find another person to do this with while he is gone. I would never risk tearing our family apart over sex but he truly believes that he’s not worth waiting for and he thinks he is unattractive. I want to make him feel better about himself because I never want anyone else and definitely wouldn’t want to raise our baby with another man. He thinks he doesn’t please me in bed enough even when he’s here and I really wanna keep thinks intimate while he is away because being physically close is not something we’ve ever had to do without...anyways that you think I could do that?