He left me

I'm 6 months pregnant and my bf just left me he said it's not me and him anymore get it through my damn head. I don't really know what happen he gave no explanation. I'm trying to act like i don't care and it's not hurting me but it is I have been nothing but there for him now I feel like he just has a new gf so he is leaving me... Maybe she is prettier maybe she has a better job maybe she has a nice body. I don't know what it is but I know I love him and I didn't care what anybody told me I didn't let that get inbetween us. I need to get over this quick I'm holding back tears haven't cried yet. Every relationship I get in I try my best and this always happens. I'm tired man so tired, they come to me and then treat me like shit why couldn't he just leave me alone. I need to get over this quick someone help me