Four months ago I started a sexual relationship with a man I met in a nightclub. We were both very drunk and ended up going back that night with him. We realised that we had incredible sexual chemistry together and that morning we stayed up chatting til dawn. I left with his number and a mutual agreement that we would both continue to see each other. At this point he made it explicit that he did not want a relationship (to avoid the expense and hassle he'd had with previous relationships) and I was completely fine with this - I was very happy being independent and single too.
It stayed casual at first - we were always really open and honest and he told me that he was seeing another girl as well as me quite early on, but she didn't have a scratch on what I did for him (I was also happy being non-exclusive, but just happened to be seeing only him at this point). I stay away from home a lot of the year, and when I left we turned it into a distance arrangement. He travels down to see me and I travel up to see him - we see each other at least once a fortnight. We text back and forth everyday/every other day, keep in contact with general chat and when I see him we spend the nights together, he offers to buy me breakfast. We chat, watch movies, go for walks and generally hang out - he'll get to know me as well as just having sex.
Recently, I feel like our initial relationship has become more intense. We've had deep conversations about our families, backgrounds, values and prospects. We've started talking about plans further down the line (basically there's no sign this is going to end) and he's invited me to his brother's party that he will be inviting family and friends to. I met his parents very casually when I was staying with him and I've also met his close friends. We act very coupley when we're together now - he has no hesitations of putting his arm around me and kissing me in public, he cuddles me and kisses my forehead, we fall asleep in each others arms, joke around, he gave me his jumper and he's always complimenting me.
Yet there's this niggling in my head that this was only meant to be a friend with benefits situation, and now I feel like I'm getting very mixed signals. I was looking for opinions as to whether you think this guy is changing his mind about wanting to stay single? Thanks for the help!