Decoding Memes

Back story: I worked with a super attractive guy for 8 months before he moved on to a new job. We low key flirted, and he knew I had a crush on him (thanks alcohol) but we are both in other relationships so never crossed any lines. We hung out a couple times after he left (with another co-worker) and even got eachother Christmas presents (just gag gifts, other co-worker was also involved). Now it's been almost a year since he left and he's kept in touch, mostly by sending sexual related memes. (ones like "be the reason someone smiles today, or drinks, or masturbates, whatever works" or "it takes 3 seconds to type a message that will make her smile for hours...'i want to make your flaps moister than an oyster'" or jokes about blowjobs.)
So I guess my question is what does it mean when a guy sends stuff like that? Is there any hidden meaning/subliminal messages, like he secretly wants me too? Or am I reading too much into it? If he didn't think of me "like that" wouldn't he just send normal funny memes without the sexual content? Help! How does a guys brain work? Lol