I dont think hes in love with me😔

This is hard to talk about, but I dont have anyone to talk to about this so ... me & my boyfriend have been together for a year & a half and since id say march theres been a change in how he acts and treats me, like he doesnt say “ i love you “ that much and if I say it he says mmhmm then I tell him why are you saying it like that so he says “looove youu “ kinda baby talk like and that annoys me! But I been thinking about how hes been lately and thats not the only thing hes also been less affectionate and pushes me away sometimes when i try to kiss him? I just dont understand any of it hes been getting mad over small stuff too like if I play around trying to bug him he cusses and sometimes leaves the room, hes the longest relationship ive had and Im hoping if youve gone threw this you can give advice! Its like “hot” & “cold” i think they call it? One time hes acting happy we get along & other times hes mad at something i did and shuts down? I just want him happy maybe hes done with me? Maybe i should stop all im doing wrong and maybe he will change how he treats me? Im tired of not knowing where i stand in the relationship & it feels like im giving 100% in the relationship & hes giving 10% 😔