Bed bug problems?

A month or two ago my bf and I got bed bugs in our apartment which we think came from a mattress his aunt and uncle gave us... I was the only one getting bitten and it sucked, every single morning I woke up with a new unbearably itchy bite. Well we had the apartment treated spent around $30 washing all of our clothes and such and a couple weeks ago I started to get bit again. Like last time I'm the only one that's getting bit however it's not every night it's every couple of nights... Could it be bed bugs again? Or could it be another insect?  Also if it is bed bugs is there any legal way I can terminate my lease before its up because it keeps happening?