Hi Im new... obviously lol

So My name is Emily and Im in a pretty serious relationship.. A lot of ppl are giving me a bad time because he is nine years older than myself, but we figure hes immature and Im over mature so we fit together perfectly... Or so I thought. It feels like lately he doesnt want to be with me and he has even said he has had his moments where he wants to be single, but "I dont want to break your heart or ever hurt you therefor I know I love you" There are some days I seem to be the light of his life, and others where I can see he doesnt want me, and there are other contributing factors to that such as his post traumatic stress from being in the navy... Well long story short (too late) I want this relationship to work, so Im looking for advice for what to do in certain circumstances... So Ill post more on the advice stuff thanks guys