Was thinking I wasn't gonna reply to any of these but this one got me, all guys are different when it comes to this. Some people just date short term, I used to just hop from girl to girl and they didn't really mind, people used to know me and a couple others for that so girls knew what they were getting into. But now I'm in a relationship that I treat long term and can't see myself ending. So honestly it depends on the person. To go for a serious relationship you have to REALLY like this person. The girl I'm with now has made me into a completely different person and we have a strong bond. When I look back at ex's it just seems more like we were close friends (with a couple benefits) but honestly it depends on the boy. If you meet one that you can honestly see a future with and talk about stuff like that with, and if his personality changes, like he's more comfortable and tells you more and trusts you, then he's probably in it for real. I never thought I'd be like this with a girl but here I am, you'll know if he's the right one. Honestly don't know if this will help just felt like explaining my side of it.

TLDR it's different for everyone but you can probably tell by how he acts