makefile re-compiles program every time

[Abbotta4]

I tried to make a makefile for a program I am working on, and it isn't behaving how it should. If I run "make serial" it will recompile the code, no matter what. Is there anything visibly wrong with the makefile?

CFLAGS = -Wall -O3
LFLAGS = -Wall
DEFAULTC = -DOMP -fopenmp
SERIALC = -Wno-pragmas

bam: main.o Model.o
        g++ $(LFLAGS) Model.o main.o -o bam

serial: main.serial.o Model.serial.o
        g++ $(LFLAGS) Model.serial.o main.serial.o -o bam

Model.o: Model.h
        g++ $(CFLAGS) $(DEFAULTC) -o Model.o -c Model.cpp

main.o: Model.h
        g++ $(CFLAGS) $(DEFAULTC) -o main.o -c main.cpp

Model.serial.o: Model.h
        g++ $(CFLAGS) $(SERIALC) -o Model.serial.o -c Model.cpp

main.serial.o: Model.h
        g++ $(CFLAGS) $(SERIALC) -o main.serial.o -c main.cpp

Model.h: Point.h Atom.h

Atom.h: Partner.h Vector.h

[ne555]

the `serial' rule does not create a `serial' file
https://www.gnu.org/software/make/manual/html_node/Phony-Targets.html

If you write a rule whose recipe will not create the target file, the recipe will be executed every time the target comes up for remaking.

By the way, you should include the *.cpp files as prerequisites.
Also Model.h: Point.h Atom.h, ¿why is a header file a target?