Does he love you like he SAYS he does? The safest answer is "no".
But that's OK, there's a much easier, less-stressful way to gauge his feelings. If you like a guy, hang out with him sex-free for 8-12 months. Have a great time together! Laugh and kiss and hold hands and plan and do fun things together.
Now, the question is no longer "does he love me like he says he does". Now the simple test is "how does he treat you after being with you this long?"
- he treats you with respect
- acknowledges your boundaries and your differences without make you feel wrong about the things you differ on
- he let's you have friends and do things without him without guilting you about it
- he "tries to get you" sexually (most guys will, perfectly normal) but when he runs into your limits doesn't make you feel like less of a good person for not "giving in"
- doesn't play mind games about making you "prove your love" for him by doing things you don't want to
... these are the actions of a person who is actually in love... or getting there.
So what he says is nice, but meaningless. You have to trust his actions and how he intentionally makes you feel. And you can't gauge that until he lets his guard down, so expect to wait 6-8 months for him to be truly acting authentic to you.
It's worth the wait, and when you find yourself with a guy after a year of dating that treats you well in all these areas, you have found a real keeper!