Is he flirting or trying to be funny?

Hi. I’m 27f and my boss is 32m. We are both in relationships and live with our partners. But, I think my boss might be very unhappy in his relationship judging by what he tells me. His gf is an alcoholic, unhygienic and never does anything (literally!). I’m also aware that his gf is jealous of me. I’m not sure why. Anyways. I’m on here to ask cus my boss makes lewd jokes around me a lot. Example: (me trying to put my tablets back in the box) “ugh I can’t get it in!” My boss: “bend over that table and I’ll get it in for you”. He’s also made other lewd comments, and obviously looks at my ass. But I’m autistic, and socially awkward. So I don’t know how to respond and just giggle. Or awkwardly blush and say “ooh!”. So I’m not sure if he is (lewdly) flirting or just trying be funny and jokey. Thanks in advance :)