Are these Signs that girlfriend is cheating?

datoneboi
Hey guys I'm sorry this is such a long post but the following incidents have been killing me and I gotta know what you guys think! So, to get started my girlfriend and I have a great relationship never argued once get along on everything and are just overall perfect and we both think we are gonna marry eachother as I have gotten her a promise ring and everything. but recently she's been acting kind of differently.
1- she never used to wear make up or dress decent to school (always sweats and a tshrjt) now she puts mascara on and wears a bit nicer clothing.

2- she used to wear this heart necklace I got for her all the time now she barely ever wears it and says she's rushing but she's always got time to shower and do other stud in the morning.

3- she is hiding our relationship. The other day her group of friends texted her saying let's hang out but we where already together, she doesn't invite me to her friend hangouts but there's this particular guy who goes out of his way to message her sep and see why She isn't coming, I'm a naturally jealous guy so it got to me and she responded the first time with a plane I can't but he asked again 3 mins later and I asked her can you please say your with your boyfriend. She said yeah I will... never did... I called her out on it and she said she didn't think it was a big deal and I told her if I asked politely if she could I think she should have to make me feel better at least, also I have NO problems Introducing her to anyone as my girlfriend. I don't know if I'm just over thinking if you guys could maybe give me significant signs that shows if she's up to no good if you think she is please help
Thanks!!!

Are these Signs that girlfriend is cheating?
4 Opinion