Is this a bad thing

Ladies I’m pretty sure my boyfriend is breaking up with me tomorrow and honestly I don’t want anyone else. Is it bad if he does break up with me I just step back from everything for awhile. I absolutely love him but tonight he said he had to tell me something he’s been scared to tell me for a couple years and then said he will tell me tomorrow in person. I started crying and he said your crying already. Then when I asked him just to say yes or no if he wanted me he quick rushed off the phone. I’m so scared to lose him. I don’t know how to feel right now. We were planning on getting married and starting a family. I just don’t want anyone besides him. I told him if we ever did breakup I don’t think I would date anyone which is completely true but now I just feel fear like the day I’m terrified of is coming true. He said he doesn’t know where he sees his future. I pray that it’s just he doesn’t want to get married or have kids yet not break up