Major probelm help plz thxxx?

okay so before i sate the whole problem im having i just wanna make sure everyone understand what my question is: (am i being extremely absurd and jealous for no reason or do i actaully have a good reasoning for being mad at my friends) okay so this is the questions and this is the scenrio that goes with it okay so lately i have been mad at two of my close freinds sammy and melissa okay so basically i used to be closed with both of them but they bth barely knew each other and they actaully met each other becoz of me but now its kind of like im out of the pic and only them two hang out alot like all three of us were close at one point we used to alway hang out togther alwayd did thing togther but know like i always see the hanging out only them two and never tell me (like we use to walk around in our neighborhood all three of us and just talk but now they jsut call up each other and leave me out and the worst part is like if ever im go to thier house like if i go to melissa's house she always pretend thats she hasnt seen sammy since like the last time we met and it's the same thing with sammy she pretends she hasnt seen melissa since all three of us hanged out but i know for a fact that they are always hanging out togther goign to the mall and coming to each others house for sleep over and all that crap but they never tell me or invite me (im jealous but at the same time it'slike i thught we all were friends so i dont understand why they dont inivte anymore like they only invite me to the big events like if they wre having a party but no to the samll thing slike goign to the movies) so do i have a reason to be mad , im really mad at melissa coz we were best friends she was in the same grade as me and we were so close so her doing that to me i just dont understand and the sammy okay so i have a birthday party and i invited her like way before everyone coz she only lives two doors away from me but then the day of the party ever one showed up including melissa but she dint *** then like melissa told me she went to newyork for the weekend (like she dint even call me to let me know she lives two doors away from and she couldnt tell me that like everyone at the prty knew that sammy was at ny but me i felt stupid coz everyone dont u know??? and then like sh e came back a week later dint even say happy birthday or came visit me so finally like after a month i went to her house to confront her about it and she said she was busy and it was a very suddenplan but then like how did evryone else knew knew about u know so im just mad at sammy ever since then and also she dint show up to my graduation and made an accuse she's sick and what i notice about her whenever i go to her house she acts like the sweetest thing and the nicest person ever and talks to me like we are best of friends and she always says oh we should hang out and od htis and that but she just sas it and never actaully makes plan to hangout and if ever i tell her lets go out to the mall or something she always has accuse but if someone else tells her she will always agree so i meani know its not that they dont like coz i would have gotten the vibe u know it's more like they want to just want me out of the pic in a way and they want to be best friends (sammy and melissa and kind of leave me out and oh one time melissa like we made an agrrement that senior year (coz we dint have a car that whenever we broguth a car to school we would let each other know and give each other a ride and i always did that but one time she brought her car for week and dint let me know until i saw her one day and she did give me a ride but was extremly rude and then she said "oh u better hurry up at the end of school coz we have to leave in a hurry or lse we r gona leave without u" and i actaully told her i'll try but becoz she was so rude i dint wan go with so at the end of the school day she did leave without me and with sammy's younger sister soo....................... i kinda hate them but i still have to them like im goign to a party and i know sammy is gona be there (melissa doesnt know that girl) but sammy is gona be ther and i dont really want talk to her but i dont wanna ruin the friendship completely so what sould i do t both of them and do i have a reason to be mad and i know being jealous but is there a reason why i should hate them???