A guy tells me everytime he thinks of me he gets hard. Does that mean he likes me or just likes me for my body? (we've been good friends for about 2 years)

Can't be sure if it's just a hormonal thing or if he genuinely has feelings for you. Could be a mixture of both!  If that's the case then...Aww That's so sweet..You make him hard...LoL!
Even though he's a good friend you need to figure out if it's love or is he just trying to get some.

Hey I'm 14 and my testosterone is goin through the roof, I can get hard openin a packet of peanuts so I wouldnt worry bout it too much :))