My husbands needs

Im currently 25 weeks and is starting to have a lot more frequent pains my husband and I love sex and its our way of bonding and communicating on how we really feel about each other it makes us strongly connected. But lately Im slowing down the sexual intercourse because of the 3rd trimester is usually the hardest part for me and the emotional part. Just when I deny the sex or make an excuse not too he gets upset and think that I don't want to bond with him and Im trying to explain to him that its not his fault. I dont know how to explain to him without him getting upset.