I need advice

I’m currently living with my bf and we’ve been together for almost 6 years now and lately I’ve noticed him not being very affectionate towards me.. he’s not the most affectionate person but lately it just seems like I’m initiating everything except sex. Idk if this is just how it’s always been or if I’m just noticing it now. What do you guys think I should do? I love him very much and I know he loves me, or at least I think he still does. Do I talk to him about it? If so how do I even start that kind of conversation?