Why do guys tend to put less effort after they win our hearts?

Anonymous
I've been dating this man for about 7 months now and we made it official on valentines day of this year.
i know it is a normal thing in a relationship to like lose that spark we had and getting used to each other and stuff. he is still constant with small things which i appreciate. but i don't understand why the effort becomes less. i partly do but i can't help but sometimes feel upset things aren't the same anymore. i do know its a part of growth as well.
we are the type of couple that don't talk all day long we text each other good morning and at the end of the day we have a habit of calling to talk about our day. we are both busy with our own life; work, studies etc.
i don't if its a him problem or not but he has been cheated on all his past relationships EVERY TIME. and i completely understand where he is coming from. but sometimes i feel bad knowing i still haven't received his 100% he told me himself this is not it. and he said he will get there in time and he doesn't want to rush things. i have never been so patient with a man so much ever in my life.
its clear that i am a priority to him after several things like his career, studies, family, and friends bc i know that's what he feels permanent as of now. he said he will give me his 100% when he is sure this will be long term. especially when we are going to start doing long distance in a few months.
the main reason why he wants to make sure is bc compared to when we first started dating and as days go by there might be change in my behavior so that he knows it wasn't fake in the beginning.
right now its like i am accepting the way everything is so that things will be better later. i love him dearly and i know he loves me back. its taking a lot of patience in this relationship i hope its better in the end.
Why do guys tend to put less effort after they win our hearts?
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