How do I get rid of this insecurity?

[Patrick]

I'm 21 years old, and the first and last relationship I had was when I was 15 years old. She cheated on me once, i forgave her, then she cheated again so we broke up. Now I have a huge insecurity with women. I don't trust them.

I met a girl and took her on a date thursday night, she spent the night because there was too much snow for her to drive home, we did not have sex. We got breakfast and spent like half the day together and I like her a lot. So then she says she had plans to go out with friends (Valentines night) to drink and said I should go; so then she goes home to get ready for that and stuff. I get a text later saying she owe's a friend a valentine's night. So then this insecurity of mine comes in and I get a knot in my stomach. Then she posts a public snapchat of her and the guy saying he's her valentine. So I asked her who he was and she just said a really good friend. Then she posts a picture of them together on instagram saying he was her valentine last year too and they were very good friends...

So am i wrong to be feeling this way? She offered last night to hang out tonight instead, so im thinking that she is into me.

But still i hate getting that knot in your stomach when the person you like is with somebody else.. and the problem is that I get it even when they're just friends..

Is there anything I can do? Will I just have to suck it up and trust her?
Idk whether or not to trust her with this situation, cause it is clear she had these plans before we met. So I guess I'll see if she wants to hang out tonight and see where it goes

[Bon.]

no trust needed, she should have been your valentine if you two are together, if not then leave her alone and don't let her play you.

[xef]

I'm in the exact same boat as you, and the only advice that I have is to let things take their course, wait it out. If this girl is truly worth being with, she'll feel the same way about you.

[Ryan]

the same thing just happend to me man dont trust her she clearly is ignoring you its sucks but i dont trust the girl who did that me she likes the other guy.

[Ann]

I now how this feel; you cannot trust her because of her past. Don't let the past ruin your future because you cannot trust anyone. Good luck to you.