I don’t know what to do anymore. I feel terrible for even writing this out. Terrible, embarrassed, ridiculous and awful. 
I know it’s wrong for me to be jealous over my boyfriends sister but I can’t help it. I try to ignore it. I try to play it cool and I try to never act on my jealousy but it’s so hard and I can’t help but feel these awful feelings inside.
(For added info: Me(25) &amp; my bf(22) are LDR, he lives in Texas and I live in Ohio. We’ve been dating since June 2020.)

When he spends time with her I feel this weird sad grief like maybe he doesn’t like spending time with me. I know that’s ridiculous but I can’t help it. We won’t get to talk on the phone tonight because he chose to go hang with her and I just feel guilty for being upset about it. I hate that I’m like this because I know it’s stupid. Anyone else get jealous over family members? Any advice?