Am i losing him? HELP! ???

i have been with my boyfriend for about a month now and we was seeing each other before we got together, we spend almost everyday together, and he always asks to see me the next day all the time, his famiy who i practically grew up with keep telling him lies about my past relationships, making out that i am a cheater and so on when i am not, and this is not good because it is making my boyfriend feel insecure, and just the other night we got into an argument about it, but then we made up and i was very upset, and we cuddled but he said it didnt feel right, however he wanted us to stay together, considering i havent done anything wrong and hes paranoid due to things they have said now, but i feel as though he has changed a bit :/ the way he texts me now is just not the same, he often never puts kisses anymore,going from loads to non is a big difference i think? and he is often funny over text, however last night was great with him, we slept together but then afterwards he didnt holdme in his arms like usuall, and then i think he could notice that i was bothered by it, he then took me into his arms and was back to his usual self again all loving, but then the next day hes back to the dodgy texting, hes definatly changed his affection through text, he often has mood swings where he changes suddenly, but i was just wondering if anyone thinks im losing him slowly or what are your opinions on it? it would be much apprichiated thanks.