Am pregnant...?

ok me and my boyfriend wanted a baby for the longest time but i just found out hes cheating on me and hes lies very much and i know he wouldnt be responsible enought for this baby so we broke am very stressed am only 17 years old i been thinkin of having abortion because am young and i think its very sad a baby growing uo without a daddy but in the other side i admire women who get pregnant and the guys leave her and they still move but i just dont know what do can i have some opinion please am scared and i just need some to tell what is the right thing..