my boyfriend would rather please himself than sleep with me :(

hiya everyone :) how are you all? right i have a it of a problem with me and my partner and im looking for some advice i dont know if hes not interested in me anymore or if its the things hes going thru thats making him act the way he is? right let me explain weve been together just over 6 months and we love each other but just lately hes been masterbating a lot he does it in the shower or when ever he gets the chance to do it sometimes he does it to porn or just does it without anything one of his friends told me that my partner said that he masterbates thinking about other people i asked my partner about this and he denied it but obviously hes going to i mean who wants their partner to know that they are masterbating about other girls? cause i know if it was me i wouldnt want my partner knowing that i was masterbating over other lads... the fact that he masterbates dont bother me but it feels like hed rather masterbate than sleep with me like last night he tried making me go down stairs to make a coffee so he could do it i did go down stairs and he did masterbate and hes been awfully distant lately he dont cuddle and kiss me has much its breaking my heart ecause when i ask about it he just shoves the conversation off and tells me to stop talking about it... we had a lil bit of a disagreement last night and i got laid on the floor and he was playing on his xbox and i dropped off to sleep but woke up like 2 mins later and i opened my eyes and i could see through the tv that he was masterbating and it made me feel really awkward so i moved my arm to make him realise i was awake and he pulled the cover over his self and pretended that he was looking at something on the internet on the xbox and then he came over to me dragged me onto the bed and wanted to sleep with me and i wanted to please him so we slept together but all way through i couldnt help but think that because he couldnt actually masterbate properly because i was in the room he decided to sleep with me which made me feel disgusting useless and used by him i mean i felt second best i felt has though hed rather masterbate than have sex with me but when its convenient for him im good enough its horrible and i told him how i feel and that i feel all he seems to do is masterbate and he said so what if that is all i do and i said yes masterbating is normal and i dont have a problem with you doing it but you would rather do that than sleep with me and he said its not all about sex thou which was very srange hearing that come out of his mouth because he loves sex he never used to be able to get enough of it but just lately he just dosent seem interested... i cant forget to mention hes currently getting over a drug addiction so maybe thats something to do with it because he says that he cant show any interest in anything else but i find that hard to believe because he shows interest in masterbating and his xbox games? hes always telling me he loves me so i have no doubt about him loving me but i do feel there is something wrong what do i do? i can talk to him until im blue in the face and im still no wiser on whats going on, i said to him last night if you dont want me anymore and your not interested in me then you need to tell me instead of you leading me on and he said what are you on about and i said well if you want to finish then just do it and he shouted at me and said i dont want to finish its just your f****d up head thats telling you that he said im like an old lady with dementia thats ready to die which i found absolute disgusting i dont understand why he just cant reassure me and tell me thats hes interested in me etc. can some one please give me some advice?xx