I'm sad cause I figured my friend's been avoiding me so their s/o wouldn't get jealous

That's actually a pretty common thing that happens. Someone gets in a new relationship then suddenly they spend less time with their friends or they cut them out completely. Sometimes it's over jealousy reasons & other times it's because they decide it's not important to make the time for you anymore.

Do you know if she's doing that to all her friends or just you?