Hey Bailey ,
I am really sorry that you feel that your boyfriend does not make as much of an effort as he used to - it can be a real pity because most people tend to feel that their significant other doesn't care as much as they used too. However, you should not over think this situation too much. Most of the time, when people have been together for a while or get too comfortable in the relationship - they tend to lose the fear that the person may leave so they try less. Furthermore, all relationships in the beginning tend to have more effort put into them, this is due to the fact you are still trying to impress the individual .Unfortunately , this phase dies out and most individuals do not attempt to continue .
In extension, for your title question - how do you know if your boyfriend really does love you ? you could check the following links http://www.eharmony.com/dating-advice/dating/biggest-signs-that-he-is-in-love-with-you/#.U2MOAcaLH1o
http://photos.essence.com/galleries/7-signs-his-love-not-real?slide=223596
http://www.yourtango.com/experts/janet-ong-zimmerman/signs-he-loves-you
http://www.wikihow.com/Know-That-Your-Boyfriend-Really-Loves-You
http://www.huffingtonpost.com/2013/04/10/husband-material_n_3056625.html
