Help help

My bf was a nice guy he would do anything for us to be always happy. We then decided to have a child, iv got excited and scared at the same time, now that I'm pregnant and iv been trying for many years he dumped me amd hes saying he is not sure if the baby is his or not I nolonger know what to do?? If I keep the baby then I'll always be remained of the bad decision I did and if I also terminate the pregnancy I'll always regret the decision is made hence I'm 29 and have no child please help me