boyfriend trouble 😭😭😭😭

I was with my boyfriend for almost a year then we broke up.... we recently got back together (about a month ago) and I found that 3 days later after we broke up he slept with another girl.... I can't seem to get over it... its always in my mind and it's worse when I'm not with him. He did it in the bed that he bought when we got together so I was the only person that had slept in that bed and now knowing he did it with another girl in there... I can't ever sleep in that bed again.... I'm just finding it really hard to get over I know we weren't together but it's a struggle for me imagining him with someone else... someone help me get over it! Because I do love him and I don't want this to ruin us 😭