Sad because i have a lack of love?

im in high school and i have been single for about 5 months. ive had a few boyfriends and each lasted around 3 to 4 months. my last relationship was more intense than any other ive had. when we broke up i had a hard time. not wih getting over him but i missed the relationship. i missed having someone to hug and kiss and call when i was upset. im fit and i'd say im pretty atractive. when im single i usauly have a lot of guys that flirt with me and text me all the time but for the last few months i have hardley talked to any guys, even my close guy friends. i dont know why this is happening but it has started to depress me. i think about love all the time and i constantly feel lonley. i dont want to do much and im starting to slip with my school work. i want answers on how to make myself feel beter and what i can do to fix my problem.. thankss