My boyfriend and I have been together for 4 years the first year was great he was all I wanted in a man. The last 3 years it has been a struggle. I found 3 videos of him having sex with other woman and it crushed my heart I truly love him and I gave him my whole heart. I got really depresses and started using drugs, I thought I wasn't good enough for him sexually. I was thinking if I was more sexually active and more of a slot in the bed that would bring us closer together. We started having a lot of wild sex, but he does not want me doing any drugs. I feel like we are very distant and we lost the friendship that we had. Our relationship is so boring, I feel like he has lost interest in me and I don't know what to do PLEASE HELP ME

Was the video made while you were together? Have you talked about it? Stop doing drugs, that's just silly.
If he is having sex elsewhere, he isn't going to stop, and it has NOTHING to do with you.
Stop being a dormat.
Talk to him.

If you think he has lost interest in you the only thing you can do is confront him. Tell hime that you don't feel any warmth or love from him any more and has he noticed? If he has then talk between yourselves see if you can salvage your relationship. If he fobs you off with a nothing then go out get the sexiest underwear you can find, lock him in a room with you and go for it. If he doesn't want any of it talk again and this time if he says he doesn't love you any more you may have to face up to the idea you can't save you relationship.

p.s. the drugs have to stop they don't help depression but they may add paranoia to your list x