I dunno how to word this well and I'm crying right now because I've worked myself into a anxiety about this. On Sunday my partner and I made plans to hangout and didn't set a time, which I was fine with. I assumed we'd hangout late afternoon, but this morning as I was getting ready he messaged me saying someone asked him to go somewhere with him and he was going to around 3. I was ok with it I just assumed it would take a couple hours and it'll be ok.

Fast forward to like 3:40 he said now it's gonna be like 5:00pm. And the not knowing the time frame really triggers my bpd and makes me feel small and that I'm undesirable or he doesn't actually want me around. This is a newer relationship and I haven't been in a relationship for about 3 years now. I'm just not sure how to bring it up without sounding clingy. 

It's really stressing me out because I know I need to explain to him how I need this for my mental health and I'm sure he'll understand but idk I don't want to be needy.

TLDR: I have to know when I'm going to see my partner or I get bad anxiety and I'm not sure how to explain without sounding clingy.