Please Help.

I've been with my boyfriend for about a year and a half. I love him alot. But alot of the time over texts its like we run out of things to talk about. And ive thought alot that maybe we text too much. But sometimes it happens in person, and theres awkward silences and it really sucks. and i can feel the boredom in the air. I dont want him to be bored with me and i feel like its my fault because sometimes i just blank and i dont know what to say. even after a year and a half. i dont know how to fix this.. please help.