he's not into me anymore

so my partner and i have been together for like 3 years now but we've never really talked about labels or anything. we just kind of did our thing, which was pretty chill. sex is good, cuddles are awesome. i'm the type who likes a bit more than that tho. i want to know them better, talk about deeper stuff, have those late night conversations and all that. but my partner... doesn't seem into it. they just want to hang out or watch movies or whatever but no real discussions. lately i've felt like we're growing apart, and the other day i was feeling really vulnerable so i asked them how they feel about us. turns out they kind of see me as a friend with benefits now, not really someone who wants more. it's crushing my heart, honestly. i still want to be with this person but at what cost? we've been through so much and now i'm just wondering if all that was for nothing. i guess i should start thinking about letting go but part of me clings on hoping they'll change their mind someday. feels like a real mess right now.