You should be getting up to adventures. He's regularly having sex with someone who doesn't know he's saying these things to you. I mean really what he's saying is that he knows you're vulnerable enough that he could "influence you" and ruin your life, but he's not mature enough to let you go, because he really wants to have sex with you. Working 80 hours a week is not something you can really do and date one person, I've done it before and it is really really non-trivial; that is 12 hours a day every day, which minus 8 hours for sleeping and leaves 4 hours total for everything else from shitting to laundry to commuting to eating. Mary, Jesus' mother was married and had him at the age of 14!
Also, from the perspective of someone closer to his age, I can not see someone in their mid-thirties having this emotional relationship with a woman that involves nothing physical for almost a year, when they are used to physical relationships, without them seeing someone else on the side - unless there is some sort of health or emotional problem he is hiding from you.
Undressed: What’s the Deal With the Age Gap in Relationships?
Before you say "I Do" I would strongly advise you both to seek professional pre-marital counseling. Dude- she can sit at the big kids table now- don't even trip! Going into the line of work he is in, I know personally maintaining one relationship is difficult enough, having two with that while working 80 hours a week is unreal. He says he really cares about you. Cindy has been dating men in their 20s for the past 15 years. I understand why alot of people may think he has a girlfriend at least not a serious one but here's just some reasons why I think he doesn't: