oh my god honey, you have to leave this guy. reading this threw up red flag after red flag and all i can say is you need to get away before the relationship becomes anymore abusive and dangerous than it already is.
it's clear to me that this boy is utterly obsessive, delusional, judgmental, racist, intolerant and so many other terrible things. without wanting to sound completely patronising, i understand that it's probably more complicated for you, being in the thick of it- but a useful exercise to do, to take yourself out of the situation- is to try and imagine how you would feel, if your best girl friend had written this post.
how would you feel, knowing that a person was treating her like that. if you don't have a best girl friend, then imagine it was your sister (if you have one) instead.
this is just horrendous. he sounds like an absolute madman- who saves photos of their current girlfriend and her exes to look at on his phone?? it sounds as if he's got some kind of god complex- he thinks you're inferior to him and his treatment of you is disgusting.
listen to me hun, you have NOTHING to feel bad about. not a single thing. i want you to read this over and over. you were in loving relationships with other guys and you had loving sex with them. this is 100% healthy and normal. even if you had slept with other guys that you weren't in a relationship with, as long as it was safe and consensual, then there's STILL nothing wrong with that. please don't feel regret. there is no reason for you to wish that your past was different. you're a good, honest person.
you are not a slut. you are not a whore. you are a good person that's been ensnared in a relationship with an extremely manipulative, vicious young man that seems to get off over hurting you, putting you down, making you feel worthless and shit about yourself.
this is abuse. and you need to end it with him. even if you can see that there are some good things about your relationship, you need to end it with him. please believe me, there are other guys out there that would embrace you and make you feel completely loved, cherished and adored- because that is what love really is. love is selfless.
if your boyfriend truly loved you, he wouldn't ever dream of calling you names or putting you down. not in a million years. if he truly loved you, the thought of causing you pain would cripple him. he would do everything in his power to protect you and keep you from harm (verbal, physical, emotional, you name it).
you have to understand that you are not responsible for him or his depression or any other reason he gives you to try and validate the abuse. /hugs/ please get out of this relationship before he inflicts anymore hurt on you. you deserve so much better than how he's treating you.