Dealing with unexpected cheating in a relationship

Hey, so I am a 20 year old female and my boyfriend was 20 as well. We spent 6 months together and through that time we formed a bond that felt like it was unbreakable. We would talk everyday either texting or phone calls for long periods of time or we would hang out with eachother. He opened up to me about all his problems and i was always was there for him making sure to always be understanding and supportive. In the past he got cheated on by a girl he said he thought he was in love with. As our relationship progressed he told me that he had never loved someone as much as he loved me. This was all new to me and even though my love for him was real, i always doubted his love for some reason, but when i brought it up a couple of times he denied it. I always gave him his space and the great thing about our relationship was that the effort was always mutual. Come to find out through the time he was with me he cheated on me 4 times. He said that they were one time things and that he knows how wrong he was but he couldn't bring him self to understand why he did it either. He said that doing these things made him love me more because he realized how no one was like me. I feel so heart broken because i always put all my effort into him and remained loyal and always loved him to the best of my ability. How could he say that he loves me so much and do that to me? Its been a couple of days since this happened and I just don't know where to go from here. I did break up with him because i know i didn't do anything to deserve this. I also was already dealing with feelings of depression for a long time before this and this just really killed me inside. I just want to get other people's perspective on this and if anyone has any tips of where I go from here that would be helpful.