Marigold...after my divorce from a long unhappy marriage, I dated, thinking I'd finally meet Mr. Right. I met them thru online dating sites.
The behavior you are describing in this man is unacceptable. If you think this man really "loves" you, you are deluding yourself. I say this, not to be cruel or judgmental, but because I did the exact same thing. I devoted myself totally to the relationship (because that is what you do in a loving relationship), while the partner is cruising via text and internet for other relationships. I devoted WAY too much of my precious time and emotional energy to these losers.
Look at it this way: if something in your gut feeling is making you unhappy about the relationship, that's a BIG RED FLAG!, and you need to listen your inner voice on this. People who meet and start forming a loving relationship should be on their BEST behavior. He is not, period. He's a playah!

I have to add here, now that I'm 10 years past trying to date, I have the perspective to look back and say to myself, "Why did I just not walk away from that! period!?" In truth, you don't owe this man anything, and you can and should just close the door on this relationship and walk away. I know, I know...you've invested your love and emotional energy, but what is he investing? Just end it, and take some time to heal, and move on.