18 weeks along and now alone

I am 20 years old, my ex fiance is 22. We were together for the past year and a half we just found out in July we were expecting. I am now 18 weeks and expecting in the last week of January. After months I finally got him to sit down and talk to me. He finally said he's been unhappy for months (dating all the way back to March/April). Proceeded to say I do not motivate him, and he's unhappy with not only the relationship but himself as well.