I feel bad for datin 4 guys at once. I just dont like the feeling of heartbreak so thats y i do it?

I have been this way since I was 17 and I was goin out with this guy who i fell in love with. We broke up and I haven't been able to trust another guy completely since. I hate talking to 4 different people but it just gives me a sense of security like say for instance that one of them dont work out then I will have others to fall back on. I dont know how to deal with heartbreak. so can I have some advice please?