Just split up with my ex but i think i'm falling for someone else is it too soon?

i split up with my ex in november i was with him for 4 years and we split up becus he treated me bad i had to move away to a new town and found it really hard to trust people but this one guy that i started working with gt my trust we slept together a couple of tyms bt he said to me nt 2 fall in love bt i cnt help it and worst of all hes in a relationship wiv a girl that he really don't wana be with he just don't wana hurt her feelings help wat should i do