I kinda have a similar issue. I have been dating my boyfriend for 2 and a half years and for some odd reason i always get suddenly angry or depressed. I believe the reason i get that way is due to hormones or something else that i see or here trigures it. For example yesterday my boyfriend got a brand new car and i got very jelous and it made me depressed since i have to drive a peice of CRAP mini van and my parents cant afford to buy me a nice car like his can. I wouldnt say that i dont love him since its not his fault that i have mood swings. But i do question whether or not i actually do or not. So just let him know to be patient with you and hopefully he will understand.