Is he just using me??

My boyfriend of 3 years left me while i'm 12 weeks pregnant last week. I was starting to get over him until he came back home and was asking me who I've been with and we ended up having sex multiple times. He stayed for a couple days to make sure I wasn't talking to this guy anymore that took me on a date and left last night to wash our clothes at his mom house which is like 45 minutes away and hasn't been back. I have an appointment this morning he knew about since forever. He text me this morning asking what time was the appointment (which he already knows) which gives me the feeling he's probably not coming.

I'm so sad, I feel so stupid.