First of all, this is a product of your age. He's a 30 year old MAN, and you are just an 18 year old GIRL. Your problem is quite clearly insecurity....which isn't a big deal, it's pretty common in girls your age. You get jealous over every little thing, so dating a man that much older than you is probably not something you're ready for. He's likely had quite a few relationships already, where you have little to none, and definitely no meaningful adult relationships. Besides that, you're investing way too much in him emotionally at such an early stage ....how can you be so crazily, madly in love with someone you've been with two months? I think you're caught up in the rush of infatuation, that dating this older man is 'exciting' and makes you feel more 'mature'.
Sorry, but if it's this bad two months in, it doesn't look good. You need to work on yourself and your insecurity issues before you will be able to make a relationship work.
Live as if you were to die tomorrow. Learn as if you were to live forever. - Mohandas Gandhi