Relationship advice

Okay ladies I'm in need of some opinions. Me and my boyfriend has only been together about a year an a half. We were surprised to find out I was pregnant early in our relationship before we ever really knew each other well. We talk all the time if we should stay together bc we do love each other but for me I feel like he's my best friend not my boyfriend like the spark just isn't there anymore.. we both have said multiple times that we don't think we would be together still  if I never would have gotten pregnant. I don't want to hurt him but what should I do? We will always be a part of each other lives Bc of our son but should I end it and co parent or just try and stick it out for him and my son. I don't know what to do Bc I don't want to hurt him but I don't want to waste his time either Bc I do love him I just don't think I'm in love with him if y'all know what I mean, also the sex seems to have gotten boring like he just doesn't turn me on like he use to anymore.. This is so hard I think I just needed to vent but some input would really help !