I Hate People (Am I dramatic??)

So I had this friend (well ex friend now, we'll call her Tiger) and me and her both started being friends in like freshman year and became like best friends in sophomore year. We went into our junior year as best friends as well (present time). We had hoco/homecoming on October 10 and she had been kind of distant after hoco but wasn't at all before hoco. We talked (before hoco) about dressed and if we had dates (she did but I did not) and stuff. During hoco she was kind of distant and only really hung out with her date (which is also my friend and they only went as friend, remember that, we'll call him ant) and another close friend of her. I had gone up to her a couple times but she didn't really talk to me and only talked to her "date" and other friend. Anyways, hoco ended at like 10, mind you I was having so much fun that I wasn't thinking about her, until my sister brought her up (me and sis were kind of upset that she kept ignoring us because at some point she did started ignoring me) and my sis was like , hey I heard from one of my friends (who is in band with tiger) that she likes ant. and I was like, what? Because me and tiger had talked about ant before and if she liked him and she said no, so i was like, she lied to me??. so that kind of made me mad. then after hoco, its Monday, tiger isn't there, Tuesday, she isn't there either and I talked to my therapist about tiger being distant (yes i go to therapy ;-;) and my therapist told me that I should talk to tiger. so i sent tiger a text and was like "hey, you okay?" and she said everything was okay ands stuff. come around Wednesday and she isn't talking to me, ignores me for a week (almost or close to two) and i finally text her what's up and she tells me that she doesn't want to be friends anymore because she heard second-hand stuff, and i was like, what stuff?. because i wanna clear things up with her because she was on of my only actual friends and i didn't want to lose her and she told me that that didn't matter, she knew where she stood in the friendship, and practically told me to fck off and then blocked me on everything. my family hates her and thinks that she stopped becoming friends with me because of ant and was jealous that i was getting closer to him as the year went on, I'm becoming more depressed to the point where I'm thinking of moving schools because i was already having problem's with loneliness. Am I being dramatic or like am i wrong for feeling depressed and sad??