Long Distance Relationship Problems HELP

So I’m in a long distance relationship, I’m in Cali and my boyfriend is in Texas. We’ve been talking since September 2017 and started dating November. Recently I’ve been thinking about the distance and it’s messing with my head. I like him so so much to the point where I can just tell him I love him but the distance is really messing me up. Last time I saw him was the week before we started dating and that was the last time I saw him. I told him how sad I am and how much I miss him and that the distance is getting to me now and he told me he misses me too and that it’s fine, but that’s not enough reassurance for me to actually believe that it’s fine. I don’t want to end it with him because of how much I have feelings towards him, but I can’t continue this long distance relationship because it’s too hard. Please help😩