Baby daddy and I

So we have a one year old and for the past 2 months he won't kiss me , hug me , barely says he loves me anymore. Always cusses at me , tries to fight with me. Talks down to me about my body . We have been together 3 going on 4 years. I don't know what's going on or why he acts like he does? Have any of you experienced this ? What should I do ?