Do i have GAD? Is so happy, am i boring?

Good day, just want to ask if im depressed? or have anxiety disorder? recently i became jealous to my bestfriend enjoying others company, whenever i see him with someone, my heart beats faster, my hands is shaking, and i cant concentrate on what i am doing. sometime its better to resign so that i will not see him anymore and forget anything because he spends more time to other people than me and i think he is not interested on me anymore because when were together he doesnt smile or laugh, but with others he is so happy, am i boring?? please help me... i dont want this feeling anymore.. i just want to be like i used to be before we became bestfriends, i wish i could turn back the time we were just workmates so that i will not experience this feeling.. i hate this feeling.