There may be someone else involved, however it could just be that he is self-improving just for himself.
Be aware that often when people have big physical changes, they feel like they can suddenly spread their wings and fly.
Although I would say just seeing the dating profile is proof enough that something is happening, and though it may not be physical yet, the intent is present.
There are a number of spy applications that will allow you to spy on your boyfriend's text messages either free online or for your laptop.
Look for apps that record keylogging like  which offers a free trial.See more questions like this: Why is he always texting back hours later I've been calling and texting my boyfriend for 3 days now and need to know if he is actually getting them and if he is talking to someone else He is receiving them unless his phone has been off and you get voicemail each time immediately when you call.But he denies cheating No one should have a dating site when they are in a relationship.I want to be able to check into my boyfriend's messages using just his number without having to pay cause I want to do a full report, do you know a website were it gives all of the information for free See more questions like this: How can I check on another device and see if my spouse is on dating sites and all sites?
I just want to know who he is talking to while ignoring me This question was answered in this Visi How article already.
I Want to know if he's cheating and with whom Please refer to the section in this Visi How article on spy apps for monitoring text messages.