Jealousy and rant but wtvr!

So like do i have something wrong wit me??? I always get jealous when my boyfriend does stuff, especially without me.  I know I get on his damn nerves and he says its okay, but it isn't okay because I'm always upset or sad. He has visited me for 2 weeks and is about to leave and go back to his house and i know I'm just gonna be more jealous than before because he kinda sucks at messaging me. like i reply right away when he texts me but he doesn't reply for a good 20 mins and it kinda pisses me off. Also his twitter is full of femboys when I'm no where close to a femboy so i get jealous of that too. I also get mad really easily, and yea it doesn't last for long but I still get upset and hurt his feelings and then I feel bad abt it. NEWAY, tips on not being jealous? He's a really good boyfriend and I feel like I'm not good enough for him so I wanna get better.