Sex with someone else...

So me and my bf been together for one year already! Everything was going good the first couple of months... he visited me we go out to plces like normal couples do... but now we dont see each other, he doesnt come to my house.. we only see each other once a week or two maybe... and i been telling why is that and he tells me idk where to take you.. but i guess soo.. i just left it like that... so i been seeing this guy.. but his just a family friend we go out to dinner and places that i never do with my bf and we had sex already... and i dont know what to do? I mean i love my bf but the things he do makes me unlove him each day..